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*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19724
19731
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19843
19850
19860
19871
19888
19890
19900
19910
19923
19932
19940
19950
19962
19970
19980
19991
20000
20011
20021
20031
20040
20050
20061
20070
20083
20094
20101
20111
20120
20136
20140
20150
20161
20170
20180
20190
20200
20210
Total46