*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19742
19750
19760
19770
19780
19791
19800
19811
19821
19830
19841
19851
19861
19871
19880
19894
19900
19910
19921
19934
19940
19954
19962
19971
19980
19991
20001
20010
20020
20030
20040
20051
20061
20071
20080
20090
201022
201114
20122
20130
20142
20151
20162
20173
20183
20191
20200
20210
Total80