January 1, 1980 $3.12 January 1, 1981 $3.37 October 1, 1987 $3.75 October 1, 1988 $4.25 April 1, 1991 $4.27 October 1, 1996 $4.77 Septem 1, 1997 $5.18 January 1, 1999 $5.65 January 1, 2000 $6.15 January 1, 2001 $6.40 January 1, 2002 $6.70 January 1, 2003 $6.90 January 1, 2004 $7.10 January 1, 2006 $7.40 January 1, 2007 $7.65 January 1, 2009 $8.00 January 1, 2010 $8.25