*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19721
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19865
19871
19882
19891
19902
19918
19929
19930
19940
19950
19960
19970
19980
19990
20000
20011
20021
20030
20040
20050
20062
20070
20080
20090
20101
20111
20120
20130
20144
20150
20161
20176
20180
20190
Total47