By years: all publications
Years	Number		Years	Number		Years	Number		Years	Number		Years	Number		Years	Number		Years	Number		Years	Number
			1930	6		1940	3		1950	10		1960	15		1970	22		1980	9		1990	2
			1931	0		1941	3		1951	13		1961	11		1971	26		1981	7		1992	1
			1932	7		1942	2		1952	12		1962	8		1972	26		1982	11		1997	1
			1933	8		1943	2		1953	12		1963	14		1973	23		1983	10		1998	2
			1934	5		1944	6		1954	12		1964	13		1974	14		1984	8		1999	1
			1935	3		1945	5		1955	12		1965	12		1975	7		1985	8		2001	1
1926	2		1936	10		1946	3		1956	6		1966	14		1976	10		1986	5		2003	2
1927	5		1937	2		1947	6		1957	22		1967	6		1977	11		1987	5		2006	2
1928	3		1938	6		1948	5		1958	18		1968	20		1978	8		1988	6
1929	6		1939	7		1949	9		1959	10		1969	18		1979	7		1989	3