*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19857
19868
19870
19880
19890
19900
19910
19921
19931
19940
19950
19960
19974
19980
19990
20000
20011
20020
20030
20040
20050
20060
20070
20082
20090
20100
20110
20120
20130
20140
20150
20160
20170
20181
20190
20200
20212
20228
20231
20240
Total38