nivel,aņo
103,1931
78,1932
121,1933
116,1934
115,1935
147,1936
119,1937
114,1938
89,1939
102,1940
99,1941
91,1942
97,1943
106,1944
105,1945
136,1946
126,1947
132,1948
104,1949
117,1950
151,1951
116,1952
107,1953
112,1954
97,1955
95,1956
119,1957
124,1958
118,1959
145,1960
122,1961
114,1962
118,1963
107,1964
110,1965
194,1966
138,1967
144,1968
138,1969
123,1970
122,1971
120,1972
114,1973
96,1974
125,1975
124,1976
120,1977
132,1978
166,1979
134,1980
138,1981