*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19751
19760
19770
19781
19792
19800
19810
19820
19832
19841
19850
19860
19870
19886
19894
19900
19919
199210
19938
19944
199510
19960
199746
19983
19992
20002
200163
20023
20037
20045
20054
20062
20076
20082
20090
201039
201114
20121
201325
20144
20154
201610
201717
201828
201940
202047
20210
20220
Total433