Spring naar inhoud
ongeveer 1929
1933
1933
1934
1935
± 1935
1936
1936
± 1937
1937
1937
1937
1938
1939
1940
1941
1941
1941
1941
1942 ong.
1942
1942
1942
1943
1943
1943
1943
1943
1943
1943
1943 ong.
1944
1944
1944
1944
1944
1944
1944
1944
1944
1944
1944
1944 ong.
1944
1944
1945
1945
±1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1945
1946
1946
1946
1946
1947
1947
1947
1947
1947
1947
1948
1948
1948
1948
1949
1949
1949
± 1950
1950
1950
± 1950
1950
1950
1950
1951
1951
1952
1952
1952
1952
1953
1953
1954
± 1954
± 1954
1954
± 1955
± 1955
± 1955
1955
1955
1955
1955
1955
± 1955 à 1956
± 1956
1956
1957
1958
1958
1958
1958
1958
1958-1959
1959
± 1960
± 1962
1962
1963
1963
1963
1963
1963
1963
± 1963
1964
± 1966
1966
1967
1968
1968
ongedateerd
1968
± 1969
1969
1969
1971
±1971
1972
1973
1973
1974
1974
1974
1975
1975
± 1975
±1975
1976
1977
1978
1978
1978
1978
1978
± 1978
1978
1978
1979
± 1979
± 1979
begonnen in 1956, voltooid 1979
1979
1979
1979
1979
1979
1979
± 1979
1979
1979
1980
1980
1980
1980
1980
1980
1980
1980
1980
1980
ongedateerd
1981
1981
1981
1981
1981
1981
1981
1981
1981
1981
1981
± 1981
1982
1982
1982
1982
1982
1982
1982
1982
1982
1982
1982
1982
1982
1982
1982
1982
1982
1982
1982
1983
1983
1983
1983
1983
1983
1983
1983
1983
1984
1984
1984
1984
1984
1984
1984
1985
1985
1985
1985
1985
1985
1985
1985
1985
1985
1985
1985?
1985
1985
1985
1985
?
1986
1986
1986
1986
1986
1986
1986
1986
1986
1986
1986
1986
1986?
1986
1986
1986
1986
1986
1986
1986
1986
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1987
1988
1988
1988
1988
1988
1988
1988
1988
1988
1988
1988
1988
1988
1988
±1988
1989
1989
1989?
1989?
1989
1989
1989
1990
1990
1990
1990
1990
1990
1990
1990
1990
1990
1990
1990
1991
1991
1991
1991
1991
1992
1992
1992
1992
1992
1992
1992
1992
1992
1992
ongeveer 1992
1993
1993
1993
1993
1993
1993
1993
1993
1993
1994
1994
1994
1994
1994
1994
1995
1995
1995
1995
1995
1996
1996
1996
1996
1996
1997
1997
1997
1997
1997
1998
1998
1998
1998
?
