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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197212
19730
19740
19750
19760
19770
19781
19792
19801
19812
19821
19830
19841
19851
198616
19871
19882
19897
199018
19913
19923
19937
19940
199520
19963
19975
19981
19993
20000
200129
20022
20032
20044
20058
20064
20071
20085
20099
201013
201123
20122
20137
20142
20153
20161
20173
201825
201941
20200
20210
Total294