*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19850
19861
19870
19880
19891
19906
19911
19923
19930
19942
19950
199622
19979
19980
19990
20000
20010
20020
200312
20040
20050
20060
20070
20080
20093
20102
20111
201215
20135
20142
20150
20162
20172
20183
20190
20200
20210
20220
Total94