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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19941
19950
19961
19970
19980
19990
20001
20010
20020
20030
20040
20050
20060
20070
20080
20091
20103
20117
20120
20132
20143
20150
20165
20170
20180
20190
20201
20211
20221
20230
20240
Total28