*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19841
19850
19860
19871
19883
19890
19900
19911
19920
19930
19940
19950
19961
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20084
20090
20104
20113
20120
20130
20140
20150
20160
20170
20180
20190
20200
20211
20221
20230
20241
Total22