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1967
to
1969
6
1970
to
1974
7
1975
to
1979
12
1980
to
1984
23
1985
to
1989
19
1990
to
1994
17
1995
to
1999
5
2000
to
2004
14
2005
to
2009
22
2010
to
2014
2,716
2015
to
2019
3,861
2020
841