1983 - Present

Effective Date Rate*
12/15/2016 3.75%
12/17/2015 3.50%
12/16/2008 3.25%
10/29/2008 4.00%
10/8/2008 4.50%
4/30/2008 5.00%
3/18/2008 5.25%
1/30/2008 6.00%
1/22/2008 6.50%
12/11/2007 7.25%
10/31/2007 7.50%
9/18/2007 7.75%
6/29/2006 8.25%
5/10/2006 8.00%
3/28/2006 7.75%
1/31/2006 7.50%
12/13/2005 7.25%
11/1/2005 7.00%
9/20/2005 6.75%
8/9/2005 6.50%
6/30/2005 6.25%
5/3/2005 6.00%
3/22/2005 5.75%
2/2/2005 5.50%
12/14/2004 5.25%
11/10/2004 5.00%
9/21/2004 4.75%
8/10/2004 4.50%
6/30/2004 4.25%
6/27/2003 4.00%
11/7/2002 4.25%
12/12/2001 4.75%
11/7/2001 5.00%
10/3/2001 5.50%
9/17/2001 6.00%
8/22/2001 6.50%
6/28/2001 6.75%
5/16/2001 7.00%
4/19/2001 7.50%
3/21/2001 8.00%
2/1/2001 8.50%
1/4/2001 9.00%
5/17/2000 9.50%
3/22/2000 9.00%
2/3/2000 8.75%
11/17/1999 8.50%
8/25/1999 8.25%
7/1/1999 8.00%
11/18/1998 7.75%
10/16/1998 8.00%
9/30/1998 8.25%
3/26/1997 8.50%
1/31/1996 8.25%
12/20/1995 8.50%
7/7/1995 8.75%
2/1/1995 9.00%
11/15/1994 8.50%
8/16/1994 7.75%
5/17/1994 7.25%
4/19/1994 6.75%
3/23/1994 6.25%
7/2/1992 6.00%
12/31/1991 6.50%
11/6/1991 7.50%
9/13/1991 8.00%
5/1/1991 8.50%
2/1/1991 9.00%
2/1/1991 9.00%
12/20/1990 9.50%
1/8/1990 10.00%
7/31/1989 10.50%
6/5/1989 11.00%
2/24/1989 11.50%
2/10/1989 11.00%
11/28/1988 10.50%
8/11/1988 10.00%
7/14/1988 9.50%
5/11/1988 9.00%
2/2/1988 8.50%
11/5/1987 8.75%
10/22/1987 9.00%
10/7/1987 9.25%
9/4/1987 8.75%
5/15/1987 8.25%
5/1/1987 8.00%
4/2/1987 7.75%
8/26/1986 7.50%
7/11/1986 8.00%
4/21/1986 8.50%
3/7/1986 9.00%
6/18/1985 9.50%
5/20/1985 10.00%
1/15/1985 10.50%
12/19/1984 10.75%
11/28/1984 11.25%
11/26/1984 11.50%
10/16/1984 12.50%
10/29/1984 12.00%
9/27/1984 12.75%
6/25/1984 13.00%
5/8/1984 12.50%
4/5/1984 12.00%
3/19/1984 11.50%
8/8/1983 11.00%