*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19893
19900
19911
19922
19930
19940
19950
19964
19970
19981
19990
20001
20013
20020
20030
20040
20050
20060
20071
20080
20090
20104
20114
20120
201323
20143
20151
20162
20172
20183
20190
20200
20210
20220
Total61