Good question… I just went looking (thank google) and found this… might help

bottom of page http://sdtreastax.com/pt_general.html

Prior Year Defaulted Tax
FISCAL YEAR NUMBER OF PARCELS
2003-2004 – 30,758
2002-2003 – 33,265
2001-2002 – 36,800
2000-2001 – 40,008
1999-2000 – 35,258
1998-1999 – 32,515
1997-1998 – 32,185
1996-1997 – 31,973
1995-1996 – 33,822

-Robby