*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19840
19850
19868
19870
19887
19893
19900
19910
19920
19930
19940
19950
19960
19971
19980
19990
20000
20014
20020
20030
20040
20050
20061
20070
20081
20090
201015
20114
20121
20130
20140
20150
20162
20171
20180
20190
Total49