Bar charts are proportional to record count, and scaled.

Publication Year	Count	Percent
1974	5	1.1
1975	3	0.7
1976	0	0.0
1977	5	1.1
1978	9	2.1
1979	13	3.0
1980	7	1.6
1981	12	2.7
1982	16	3.6
1983	17	3.9
1984	17	3.9
1985	8	1.8
1986	20	4.6
1987	10	2.3
1988	11	2.5
1989	10	2.3
1990	11	2.5
1991	18	4.1
1992	21	4.8
1993	18	4.1
1994	16	3.6
1995	21	4.8
1996	29	6.6
1997	19	4.3
1998	20	4.6
1999	21	4.8
2000	21	4.8
2001	15	3.4
2002	11	2.5
2003	10	2.3
2004	11	2.5
2005	14	3.2

Items: 32