Taxpayer Delinquent Return Investigations Fiscal Year Investigations 1992 1,525,056 1993 1,468,914 1994 1,613,307 1995 1,937,841 1996 1,815,340 1997 1,635,782 1998 1,882,680 1999 2,313,873 2000 1,670,447 2001 1,445,436 2002 1,422,000 2003 2,490,000 2004 2,051,000 2005 2,558,000 2006 2,373,000 2007 2,587,000 2008 1,972,000

Source: Internal IRS collection reports  

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