1965 Mar, Apr, Jun, Sept, Nov
1966 Jan-Mar, Sept-Dec
1967 Mar, May, Jun, Dec
1968 Jan, March-Jun, Sept- Dec
1969 Mar-Jun, Sept, Oct
1970 Apr, May, Oct, Nov
1971 Jan, Feb, Apr, May, Oct, Nov
1972 Jan, Feb, Apr, Oct
1973 Feb, Apr, Sept-Dec
1974 Jan-June, Sept- December
1975 Jan-April, June, Sept, Oct, December
1976 Jan-May, Nov, Dec
1977 Jan-June, Sept-Nov
1978 Jan-June, Sept- Dec
1979 Jan-June, Sept-Dec
1980 Jan-June, Sept-Dec
1981 January- December inclusive
1982 January- December inclusive
1983 January- December inclusive
1984 January- December inclusive
1985 January- December inclusive
1986 January- December inclusive
1987 January- December inclusive
1988 January- December inclusive
1989 January- December inclusive
1990 January-May, Sept-December
1991 January- December inclusive
1992 January- December inclusive
1993 January- December inclusive
1994 January- December inclusive
1995 January- December inclusive
1996 January- December inclusive
1997 Jan- Oct, Dec
1998 January- December inclusive
1999 January- December inclusive
2000 January- December inclusive
2001 January- December inclusive
2002 January- December inclusive
2003 January- December inclusive
2004 June/July/Aug- December
2005 January, Feb, Apr- December
2006 Feb, May, June/July, Oct, Nov, Dec
2007 Jan, Mar, June/July/August
2008 May, December
2009 Apr, June/July/August, Oct
2010 Mar, Apr, May
2011 Apr, May, Nov
2012 Jan, Feb, Apr