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Year	Item count	Graph
1930	1
1931	1
1932	1
1933	1
1937	1
1940	1
1942	2
1949	3
1951	1
1952	4
1955	2
1956	1
1957	1
1958	1
1959	3
1960	2
1961	8
1962	5
1963	6
1964	4
1965	3
1966	1
1967	8
1968	4
1969	3
1972	3
1973	2
1974	3
1976	3
1977	4
1978	6
1979	4
1980	10
1981	5
1982	15
1983	5
1984	12
1985	12
1986	14
1987	12
1988	26
1989	24
1990	20
1991	21
1992	21
1993	34
1994	56
1995	67
1996	76
1997	153
1998	177
1999	193
2000	213
2001	322
2002	335
2003	352
2004	431
2005	551
2006	585
2007	558
2008	554
2009	665
2010	676
2011	904
2012	389
in press	131