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1973
to
1974
3
1975
to
1979
4
1980
to
1984
4
1985
to
1989
18
1990
to
1994
26
1995
to
1999
31
2000
to
2004
42
2005
to
2009
80
2010
to
2014
230
2015
to
2019
297
2020
43