*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19891
19900
19910
19920
19937
19942
19950
19964
19971
19981
19992
20000
20010
20024
20030
20040
20051
20060
20070
20080
20090
20105
20111
20122
20131
20142
20158
20164
20171
20180
20195
20202
20211
20222
20234
202410
Total73