curve

1 1961 Jul 3 1963 Sep Oct Nov Dec 4 1964 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 5 1965 May Feb Jan Mar Apr Jun Jul Sep Oct Nov Dec

6 1966 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 7 1967 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 8 1968 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 9 1969 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec