*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19851
19860
19870
19880
19890
19901
19911
19920
19930
19940
19950
19960
19970
19980
19991
20001
20010
20020
20030
20040
20050
20060
20071
20080
20090
20104
20113
20120
20130
20142
20150
20164
20170
20180
20194
20202
20215
20227
20230
20245
Total43