One of my friends is a huge Mariah Carey stan, and here is a list of the Mariah Carey's Worlwide sales according to him:
1990: Mariah Carey (18 Million)
1991: Emotions (10 Million)
1993: Music Box (32 Million)
1994: Merry Christmas (15 Million)
1995: Daydream (25 Million)
1997: Butterfly (15.5 Million)
1999: Rainbow (12 Million)
2001: Glitter (3.5 Million)
2003: Charmbracelet (5 Million)
2005: The Emancipation of Mimi (19 Million)
2008: E=MC2 (8 Million)

2009: Memoirs of an Imperfect Angel (5.2 Million)
2010: Merry Christmas II You (2.4 Million)
*~* Other Albums *~*
1992: MTV Unplugged (9 Million)
1998: Number Ones (17 Million)
2000: Valentines (6 Million)
2001: Greatest Hits (4.6 Million)
2003: The Remixes (1.3 Million)
2008: The Ballads (5 Million)
2010: Playlist: The Very Best of MC (2 Million)
According to him, all these numbers were taken from some Mariah Carey documentary or something like that.
Discuss, and maybe post the REAL numbers for some of these albums