Thanks for the comments!
20. Taylor Swift - The Best Day
19. Lenka - The Show
18. Shontelle feat. Akon - Stuck With Each Other [11 Days | Peak: 4]
17. The Pussycat Dolls - Hush Hush (I Will Survive) [5 Days | Peak: 8]
16. The Pussycat Dolls - Jai Ho (You Are My Destiny) [17 Days | Peak: 4]
15. Keri Hilson feat. Ne-Yo & Kanye West - Knock You Down [23 Days | Peak: 2]
14. Esmée Denters - Outta Here [6 Days | Peak: 4]
13. Jazmine Sullivan - Dream Big [36 Days | Peak: 1(1)]
12. Adele - Make You Feel My Love [28 Days | Peak: 2]
11. Kelly Clarkson - I Do Not Hook Up [30 Dyas | Peak: 4] |
  | Demi Lovato
Don't Forget
[15th Day | -3 | Peak: 5] |
  | The Black Eyed Peas
I Gotta Feelin'
[2nd Day | +1 | Peak: 9] |
  | The Saturdays
Just Can't Get Enough
[5th Day | -3 | Peak: 4] |
  | Kris Allen
No Boundaries
[8th Day | RETURN | Peak: 4] |
  | The Black Eyed Peas
Boom Boom Pow
[35th Day | = | Peak: 1(7)] |
  | The Saturdays
Issues
[1st Day | DEBUT | Peak: 5]
*i've got issues. |
  | David Archuleta
Touch My Hand
[32nd Day | -2 | Peak: 1(7)] |
  | Jordin Sparks
Battlefield
[4th Day | +1 | Peak: 1(1)] |
  | Katy Perry
Waking Up In Vegas
[30th Day | +1 | Peak: 1(1)] |
  | Taylor Swift
You Belong With Me
[31st Day | = | Peak: 1(7)] |
  | Natasha Bedingfield
Pocketful Of Sunshine
[40th Day | = | Peak: 1(7)]
*retires! |
| | The Pussycat Dolls
Hush Hush (I Will Survive)
[5th Day | -1 | Peak: 8] |
| | Esmée Denters
Outta Here
[6th Day | +2 | Peak: 4] |
2008Rihanna - Don't Stop The Music (40th Day/@1/Peak = 1[17x]) [February 22, 2008 {First Retiree}]
Britney Spears - Piece of Me (40th Day/@1/Peak = 1[17x]) [February 23, 2008]
Rihanna feat. Ne-Yo - Hate That I Love You (40th Day/@5/Peak = 1[1x]) [March 8, 2008]
Ashlee Simpson - Outta My Head (Ay Ya Ya) (40th Day/@8/Peak = 1[2x]) [March 12, 2008]
Chris Brown - With You (40th Day/@1/Peak = 1[4x]) [March 22, 2008]
Taylor Swift - Teardrops On My Guitar (40th Day/@7/Peak = 4) [March 22, 2008]
Cassie - Is It You (40th Day/@1/Peak = 1[3x]) [April 7, 2008]
Vanessa Hudgens - Say OK (40th Day/@1/Peak = 1[2x]) [April 11, 2008]
Timbaland feat. Keri Hilson and Nicole Scherzinger - Scream (40th Day/@10/Peak = 1[1x]) [April 16, 2008]
Leona Lewis - Bleeding Love (40th Day/@4/Peak = 2) [April 16, 2008]
Jordin Sparks and Chris Brown - No Air (40th Day/@1/Peak = 1[16x]) [April 16, 2008]
Lil' Mama feat. T-Pain and Chris Brown - Shawty Get Loose (40th Day/@1/Peak = 1[4x]) [April 25, 2008]
Paula Abdul - Dance Like There's No Tomorrow (40th Day/@2/Peak = 1[2x]) [April 26, 2008]
Mariah Carey - Touch My Body (40th Day/@3/Peak = 1[1x]) [May 5, 2008]
Kylie Minogue - Wow (40th Day/@1/Peak = 1[4x]) [May 8, 2008]
Colbie Caillat - Realize (40th Day/@4/Peak = 1[1x]) [May 11, 2008]
Ne-Yo - Go On Girl (40th Day/@18/Peak = 7) [May 11, 2008]
Carrie Underwood - All-American Girl (40th Day/@7/Peak = 3) [May 13, 2008]
Danity Kane - Damaged (40th Day/@5/Peak = 1[5x])[May 13, 2008]
Kat DeLuna feat. Busta Rhymes - Run The Show (40th Day/@2/Peak = 1[2x])[May 13, 2008]
Britney Spears - Break The Ice (40th Day/@4/Peak = 4)[May 13, 2008]
Sara Bareilles - Love Song (40th Day/@8/Peak = 8) [May 13, 2008]
Natasha Bedingfield feat. Sean Kingston - Love Like This (40th Day/@3/Peak = 3) [May 15, 2008]
Aly and AJ - Chemicals React (40th Day/@1/Peak = 1[3x]) [May 25, 2008]
Leona Lewis - Better In Time (40th Day/@3/Peak = 2) [May 25, 2008]
Natasha Bedingfield - Pocketful Of Sunshine (40th Day/@1/Peak = 1[7x]) [June 7,2008]
Madonna and Justin Timberlake feat. Timbaland - 4 Minutes (40th Day/@7/Peak = 5) [June 7,2008]
Ferras - Hollywood's Not America (40th Day/@9/Peak = 5) [June 7,2008]
Rihanna - Take A Bow (40th Day/@1/Peak = 1[8x]) [June 10, 2008]
The Veronicas - This Love (40th Day/@3/Peak = 3) [June 12, 2008]
Kylie Minogue - In My Arms (40th Day/@7/Peak = 7) [June 13, 2008]
Chris Brown - Forever (40th Day/@1/Peak = 1[2x]) [June 13, 2008]
Mariah Carey - Bye Bye (40th Day@1/Peak = 1[20x]) [June 18, 2008]
Lil' Mama - L.I.F.E. (40th Day@7/Peak = 7) [June 18, 2008]
Paramore - That's What You Get (40th Day/@1/Peak = 1[2x]) [June 22, 2008]
Duffy - Warwick Avenue (40th Day/@2/Peak = 1[1x]) [June 29, 2008]
Kate Voegele - Only Fooling Myself (40th Day/@1/Peak = 1[5x]) [June 29, 2008]
Alicia Keys - Teenage Love Affair (40th Day/@10/Peak = 5) [July 3, 2008]
The Ting Tings - That's Not My Name (40th Day/@1/Peak = 1[4x]) [July 5, 2008]
Kerli - Walking On Air (40th Day/@4/Peak = 1[2x]) [July 9, 2008]
Ashlee Simpson - Little Miss Obsessive (40th Day/@2/Peak = 1[3x]) [July 15, 2008]
Jordin Sparks - One Step At A Time (40th Day/@1/Peak = 1[5x]) [July 22, 2008]
Kylie Minogue - All I See (40th Day/@8/Peak = 7) [July 22, 2008]
Lady GaGa feat. Colby O'Donis - Just Dance (40th Day/@1/Peak = 1[10x]) [July 30, 2008]
The Ting Tings - Shut Up And Let Me Go (40th Day/@7/Peak = 4) [August 2, 2008]
Rihanna - Disturbia (40th Day/@1/Peak = 1[15x]) [August 11, 2008]
Miley Cyrus - 7 Things (40th Day/@1/Peak = 1[10x]) [August 20, 2008]
Fergie - Big Girls Don't Cry (40th Day/@1/Peak = 1[4x]) [August 27, 2008]
Keri Hilson - Energy (40th Day/@2/Peak = 1[3x]) [August 27, 2008]
Alicia Keys - Superwoman (40th Day/@1/Peak = 1[5x]) [September 7, 2008]
September - Cry For You (40th Day/@2/Peak = 1[2x]) [September 7, 2008]
Mariah Carey - I'll Be Lovin' U Long Time (40th Day/@1/Peak = 1[1x]) [September 8, 2008]
Katy Perry - I Kissed A Girl (40th Day/@4/Peak = 1[1x]) [September 12, 2008]
Jennifer Hudson - Spotlight (40th Day/@1/Peak = 1[5x]) [September 15, 2008]
Danity Kane - Bad Girl (40th Day/@7/Peak = 5) [September 16, 2008]
Keyshia Cole - Heaven Sent (40th Day/@1/Peak = 1[5x]) [September 18, 2008]
Solange - Sandcastle Disco (40th Day/@1/Peak = 1[15x]) [October 3, 2008]
The Tings Tings - Be The One (40th Day/@1/Peak = 1[8x]) [October 22, 2008]
P!nk - So What (40th Day/@1/Peak = 1[5x]) [October 25, 2008]
Christina Aguilera - Keeps Gettin' Better (40th Day/@1/Peak = 1[12x]) [October 31, 2008]
Britney Spears - Womanizer (40th Day/@1/Peak = 1[8x]) [November 27, 2008]
Various Artists - Just Stand Up (40th Day/@1/Peak = 1[8x]) [December 7, 2008]
Lady GaGa - Poker Face (40th Day/@1/Peak = 1[8x]) [December 8, 2008]
Shontelle - T-Shirt (40th Day/@4/Peak = 1[7x]) [December 17, 2008]
Mariah Carey - I Stay In Love (40th Day/@1/Peak = 1[3x]) [December 17, 2008]
Rihanna - Rehab (40th Day/@1/Peak = 1[2x]) [December 25, 2008]
Beyoncé - Single Ladies (40th Day/@4/Peak = 1[3x]) [December 31, 2008]
2009
Solange - T.O.N.Y. (40th Day/@1/Peak = 1[10x]) [January 12, 2009]
David Cook - Light On (40th Day/@1/Peak = 1[1x]) [January 18, 2009]
Britney Spears - Circus (40th Day/@1/Peak = 1[12x]) [January 24, 2009]
Miranda Cosgrove - About You Now (40th Day/@1/Peak = 1[7x]) [January 29, 2009]
Girls Aloud - The Loving Kind (40th Day/@3/Peak = 2) [February 4, 2009]
Katy Perry - Thinking Of You (40th Day/@1/Peak = 1[5x]) [February 5, 2009]
Taylor Swift - Love Story (40th Day/@1/Peak = 1[3x]) [February 8, 2009]
Beyoncé - Halo (40th Day/@1/Peak = 1[1x]) [February 9, 2009]
Beyoncé - Diva (40th Day/@2/Peak = 1[31x]) [February 9, 2009]
Lady GaGa - Beautiful, Dirty, Rich (40th Day/@2/Peak = 2) [February 21, 2009]
David Archuleta - A Little Too Not Over You (40th Day/@1/Peak = 1[3x]) [February 25, 2009]
Kelly Clarkson - My Life Would Suck Without You (40th Day/@1/Peak = 1[18x]) [March 26, 2009]
Lady GaGa - Eh Eh (Nothing Else I Can Say) (40th Day/@1/Peak = 1[5x]) [April 2, 2009]
Taylor Swift - White Horse (40th Day/@1/Peak = 1[10x]) [April 10, 2009]
Jennifer Hudson - If This Isn't Love (40th Day/@1/Peak = 1[2x]) [April 14, 2009]
Miley Cyrus - The Climb (40th Day/@1/Peak = 1[5x]) [April 17, 2009]
Britney Spears - If U Seek Amy (40th Day/@1/Peak = 1[11x]) [May 7, 2009]
Ciara feat. Justin Timberlake - Love Sex Magic (40th Day/@1/Peak = 1[8x]) [May 17, 2009]
