*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19901
19910
19920
19932
19943
19950
19961
19970
19980
19990
20000
20012
20020
20038
20040
20050
20061
20070
20080
20090
201013
201120
20120
201320
20142
20150
20163
201712
201816
20196
20200
20210
20220
Total112