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1971
to
1974
1
1975
to
1979
4
1980
to
1984
6
1985
to
1989
19
1990
to
1994
15
1995
to
1999
45
2000
to
2004
42
2005
to
2009
130
2010
to
2014
469
2015
to
2019
420
2020
31