Bar charts are proportional to record count, and scaled.

Publication Year	Count	Percent
1932	1	0.0	.
1933	0	0.0
1934	1	0.0	.
1935	0	0.0
1936	1	0.0	.
1937	1	0.0	.
1938	1	0.0	.
1939	1	0.0	.
1940	4	0.2	.
1941	4	0.2	.
1942	1	0.0	.
1943	0	0.0
1944	1	0.0	.
1945	0	0.0
1946	0	0.0
1947	4	0.2	.
1948	1	0.0	.
1949	4	0.2	.
1950	4	0.2	.
1951	4	0.2	.
1952	2	0.1	.
1953	3	0.1	.
1954	3	0.1	.
1955	4	0.2	.
1956	2	0.1	.
1957	4	0.2	.
1958	3	0.1	.
1959	2	0.1	.
1960	5	0.2	.
1961	10	0.5	.
1962	13	0.6	.
1963	13	0.6	.
1964	16	0.8	.
1965	18	0.9	.
1966	18	0.9	.
1967	21	1.0	.
1968	22	1.0	.
1969	29	1.4	.
1970	26	1.2	.
1971	26	1.2	.
1972	23	1.1	.
1973	34	1.6	.
1974	41	1.9	.
1975	35	1.7	.
1976	45	2.1	.
1977	45	2.1	.
1978	42	2.0	.
1979	49	2.3	.
1980	55	2.6	.
1981	55	2.6	.
1982	51	2.4	.
1983	64	3.0	.
1984	66	3.1	.
1985	84	4.0	.
1986	54	2.6	.
1987	62	2.9	.
1988	56	2.6	.
1989	54	2.6	.
1990	64	3.0	.
1991	57	2.7	.
1992	40	1.9	.
1993	53	2.5	.
1994	52	2.5	.
1995	50	2.4	.
1996	56	2.6	.
1997	57	2.7	.
1998	51	2.4	.
1999	45	2.1	.
2000	61	2.9	.
2001	60	2.8	.
2002	49	2.3	.
2003	62	2.9	.
2004	51	2.4	.
2005	51	2.4	.
2006	45	2.1	.
2007	24	1.1	.

Items: 76