The number in brackets is the ranked position of total sales for each artist (if that makes any sense). Duets are not included.
1985 - no data
1986 - ? albums (#24)
1987 - 902 000 albums (#6); 1 011 000 singles (#3); 267 000 singles with Dusty (#66)
1988 - 1 038 000 albums (#8 ); 687 000 singles (#8 )
1989 - 323 000 albums (#51); 177 000 singles (#91)
1990 - ? albums (#78 ); ? singles (#45)
1991 - no data for albums; ? singles (#39)
1992 - not on top 100s
1993 - 297 000 albums (#36); 347 000 singles (#27)
1994 - 173 200 albums (#81); 216 900 singles [inc. Ab Fab] (#73)
1995 - not on top 100s
1996 - 120 000 albums (#97); 250 000 singles (#72)
1997 - not on top 100s
1998 - not on top 100s
1999 - not on top 100s
2000 - not on top 100s
2001 - not on top 50s
2002 - not on top 50s
2003 - not on top 50s
2004 - not on top 50s
Total January 1990 - July 1998 (not sure why) - 1 614 000 albums (#76)
Total January 1990 - January 1999 (ditto) - 1 431 000 singles (#61)
Total up to January 2003 (as featured on C4) - 4 913 655 singles (#38 )
So there you go...