These are the number of albums selling over a million in each calendar year using SoundScan numbers only.
1994 - 69
1995 - 64
1996 - 56
1997 - 70
1998 - 81
1999 - 88
2000 - 88
2001 - 100
2002 - 65
2003 - 70
2004 - 70
2005 - 48
2006 - 52
2007 - 39
2008 - 25
2009 - 22
2010 - 13
2011 - 13
2012 - 10
2013 - 01 (so far)
1994 - 69
1995 - 64
1996 - 56
1997 - 70
1998 - 81
1999 - 88
2000 - 88
2001 - 100
2002 - 65
2003 - 70
2004 - 70
2005 - 48
2006 - 52
2007 - 39
2008 - 25
2009 - 22
2010 - 13
2011 - 13
2012 - 10
2013 - 01 (so far)