1931
a
1932
a
1933
a
1934
a
1938
a
1939
a
1940
a
1941
a
1942
a
1943
a
1944
a
1945
a
1946
a
1947
a
1948
a
1949
a
1950
a
1951
a
1952
a
1953
a
1954
a
1955
a
1956
a
1957
a
1958
a
1959
a
1960
a
1961
a
1962
a
1963
a
1964
a
1965
a
1966
a
1967
a
1968
a
1969
a
1970
a
1971
a
1972
a
1973
a
1974
a
1975
a
1976
a
1977
a
1978
a
1979
a
1980
a
1981
a
1982
a
1983
a
1984
a
1985
a
1986
a
1987
a
1988
a
1989
a
1990
a
1991
a
1992
a
1993
a
1994
a
1995
a
1996
a
1997
a
1998
a
1999
a
2000
a
2001
a
2002
a
2003
a
2004
a
2005
a
2006
a
2007
a
2008
a
2009
a
2010
a
2011
a
2012
a
2013
a
2014
a
2015
a