*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19723
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19873
19881
19890
199021
19914
19920
19930
19940
19950
19960
19970
19980
19991
20000
20013
20020
20030
20040
20050
20064
20070
20083
20090
20109
20112
20122
20131
20142
20151
20161
20171
20180
20190
Total62