*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19841
19854
19860
19870
19881
19890
19900
199128
19922
19932
19940
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20081
20090
20102
20111
20120
20138
20140
20150
20160
20170
20181
20190
20200
20210
20220
20230
20240
Total52