*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19821
19832
19843
19850
19860
19874
19880
19891
19900
19910
19922
19934
19942
19950
19961
19972
19980
19996
20000
20011
20020
20030
20041
20051
20060
20070
20080
20090
20107
20113
20121
20130
20140
20151
20161
20170
20183
20190
20204
20212
20220
20231
20243
Total58