1979   April 3rd

1980   April 8th

1981   April 2nd

1982   April 20th

1983   April 13th

1984   April 6th

1985   April 8th

1986   April 15th

1987   April 16th

1988   April 18th

1989   April 26th

1990   April 20th

1991   April 7th

1992   April 29th

1993   April 26th

1994   April 19th

1995   April 12th

1996   April 20th

1997   April 27th

1998   April 3rd

1999   April 6th

2000   March 25th

2001   April 19th

2002   April 12th

2003   April 21st

2004   April 16th

2005   April 20th

2006   April 12th