*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19882
19891
19902
19913
19924
19931
19940
19950
19960
19970
19980
19990
20000
20013
20020
20031
20048
20050
20062
20071
20082
20094
20104
20116
20121
20132
20142
20151
20164
20175
20180
Total59