Bar charts are proportional to record count, and scaled.

Publication Year	Count	Percent
1941	1	0.2	.
1942	0	0.0
1943	0	0.0
1944	0	0.0
1945	0	0.0
1946	0	0.0
1947	0	0.0
1948	0	0.0
1949	0	0.0
1950	0	0.0
1951	0	0.0
1952	1	0.2	.
1953	12	2.6	.
1954	13	2.8	.
1955	22	4.8	.
1956	26	5.7	.
1957	20	4.4	.
1958	15	3.3	.
1959	14	3.1	.
1960	11	2.4	.
1961	16	3.5	.
1962	7	1.5	.
1963	14	3.1	.
1964	6	1.3	.
1965	9	2.0	.
1966	11	2.4	.
1967	6	1.3	.
1968	6	1.3	.
1969	9	2.0	.
1970	4	0.9	.
1971	4	0.9	.
1972	7	1.5	.
1973	5	1.1	.
1974	6	1.3	.
1975	4	0.9	.
1976	4	0.9	.
1977	5	1.1	.
1978	1	0.2	.
1979	3	0.7	.
1980	5	1.1	.
1981	8	1.7	.
1982	1	0.2	.
1983	7	1.5	.
1984	5	1.1	.
1985	6	1.3	.
1986	8	1.7	.
1987	0	0.0
1988	5	1.1	.
1989	7	1.5	.
1990	4	0.9	.
1991	2	0.4	.
1992	3	0.7	.
1993	8	1.7	.
1994	3	0.7	.
1995	5	1.1	.
1996	8	1.7	.
1997	8	1.7	.
1998	2	0.4	.
1999	9	2.0	.
2000	4	0.9	.
2001	10	2.2	.
2002	4	0.9	.
2003	28	6.1	.
2004	16	3.5	.
2005	13	2.8	.
2006	11	2.4	.
2007	6	1.3	.

Items: 67