*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19792
19801
19813
19821
19830
19841
19851
198617
19870
19881
19897
19901
19912
19922
19936
19940
199520
19962
19975
19981
19993
20000
200129
20022
20033
20044
200510
20064
20072
20085
200910
201013
201123
20123
20138
20143
20153
20163
20178
201830
201951
202031
202120
202253
202314
20240
Total409