*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
19870
19880
19891
19900
19910
19921
19931
19940
19954
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20061
20070
20080
20090
20101
20113
20120
20130
20140
20151
20166
20170
20181
20192
20201
20211
20220
20230
20240
Total24