*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19881
19890
19901
19910
19920
19932
19941
19950
19961
19971
19983
19993
20007
20012
20020
20030
20041
20054
20061
20070
20081
20090
20101
20111
20120
20132
20142
20155
20162
20173
20186
201915
202018
20212
20221
20230
20242
Total90