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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19742
19753
19760
19770
19781
19791
19801
19811
19823
19832
19841
19850
19861
19870
19882
19891
19901
19912
19920
19932
19941
19952
19961
19971
19980
19990
20000
20012
20020
20030
20040
20050
20061
20070
20080
20091
20101
20110
20120
20131
20141
20150
20162
20170
20181
20190
20200
20210
Total40