*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19743
19752
19760
19770
19781
19790
19801
19810
19820
19830
19840
19851
19860
19870
19880
19891
19902
19910
19920
19931
19941
19950
19960
19974
19981
19990
20001
20012
20020
20030
20040
20050
20060
20070
20081
20090
20101
20112
20121
20132
20141
20151
20160
20171
20180
20190
20200
20210
20220
Total31