1972

1973

1974

1975

1976

1977

1978

1979

1980

1981

1982

1983

1984

1985

1986

1987

1988

1989

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

2012

January

C

X

X

X

X

X

X

X

X

X

X

X

X

N/A

XX

XX

XX

XX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

February

X

X

X

X

X

X

X

X

X

X

X

X

X

X

N/A

N/A

X

XX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

March

C

X

X

X

X

X

X

X

X

X

X

X

X

X

XX

X

X

XX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

April

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

XX

X

XX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

May

X

X

X

X

X

X

X

X

X

X

X

X

X

X

N/A

XX

X

XX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

June

X

X

X

X

X

X

X

X

X

X

C

X

X

X

XX

N/A

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

July

N/A

X

X

X

X

X

X

X

C

X

X

X

X

X

N/A

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

August

X

X

X

X

X

X

X

X

X

X

X

X

N/A

X

XX

N/A

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

September

X

X

X

X

N/A

X

X

X

X

X

X

X

X

N/A

XX

N/A

XX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

October

X

X

X

X

X

X

X

N/A

X

X

X

X

X

X

XX

X

XX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

November

X

X

N/A

X

X

X

X

X

X

X

X

X

X

X

XX

XX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

December

X

X

X

X

X

X

X

X

X

X

X

X

X

XX

XX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X = Have

XX = Duplicate

O = Ordered

C = Copy

N/A = Not published