*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19722
19731
19740
19750
19760
19771
19780
19790
19800
19810
19821
19830
19840
19850
19860
19870
19880
19890
19901
19910
19920
19931
19943
19953
19960
19970
19983
19990
20000
20015
20023
20031
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total25