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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19781
19790
19800
19810
19821
19830
19840
19851
19860
19873
19884
19891
19908
19917
19921
19930
19943
19952
19962
19970
19983
19992
20000
20012
20020
20030
20040
20050
20060
20070
20080
20090
20102
20115
20122
20134
20143
20151
20166
201710
20188
20190
20200
20210
Total83