Welcome to my 3rd countdown lmfao. I let all the old ones flop but not this one!
I only include songs released this year. Album tracks can only chart if they have a significantly higher amount than the other non-single tracks the album. Songs from the previous year can chart also. The only way a song from the year before the year before can chart is if it's on the last chart of the previous year. I know it's confusing. (Since Rihanna's 'Diamonds' was released in 2012, it can chart in 2013. The only way it can chart in 2014 is if it is on the final chart of 2013 and carries over. Once it falls off, it cannot chart again and songs from 2012 can no longer debut in the top ten.) Sales are calculated simply. 1 play = 10k in sales.