Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

1990

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

1991

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

1992

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

1993

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

1994

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

1995

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

1996

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

1997

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

1998

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

1999

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES