*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19890
19900
19910
19921
19930
19940
19950
19960
19975
19980
19991
20000
20010
20020
20031
20046
20052
20061
20070
20080
20090
20101
20111
20121
20130
20140
20151
20164
20170
20182
20191
20200
20212
20220
20230
20240
Total32