Jahr
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1955
2
1956
2
1957
2
1958
2
1959
2
1960
2
1961
2
1962
2
1963
2
1964
2
1965
2
1966
2
1967
2
1968
2
1969
2
1970
2
1971
3
1972
3
1973
3
1974
3
1975
4
1976
4
1977
4
1978
4
1979
4
1980
5
1981
5
1982
5
1983
5
1984
5
1985
6
1986
6
1987
6
1988
8
1989
12
1990
25
1991
46
1992
83
1993
160
1994
267
1995
1996
169