*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
19880
19893
19901
19910
19921
19932
19940
19951
19961
19971
19980
19990
20000
20010
20020
20030
20040
20051
20060
20071
20080
20090
201022
201114
20122
20130
20142
20151
20161
20171
20180
Total56