*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19811
19821
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19931
19940
19950
19961
19970
19980
19991
20001
20011
20020
20030
20040
20050
20060
20070
20080
20090
20108
20112
20120
20130
20140
20151
20160
20171
20181
20190
20201
20211
20220
20230
20240
Total23