*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19741
19751
19760
19771
19780
19791
19800
19812
19820
19830
19841
19850
19860
19870
19880
19891
19902
19910
19920
19931
19942
19950
19967
19970
19980
19991
20000
20010
20021
20033
20040
20050
20062
20070
20080
20090
201019
201155
20121
20135
20140
20151
201610
20179
201811
2019106
20200
20210
20220
Total244