*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19890
19901
19910
19921
19934
19940
19950
19961
19971
19980
19990
20001
20010
20020
20030
20041
20050
20060
20070
20084
20091
20103
20110
20120
20131
20140
20150
20161
20171
20180
20190
20200
20210
20220
20230
20240
Total22