*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19910
19920
19931
19941
19951
19960
19970
19981
19990
20001
20012
20020
20031
20040
20050
20061
20070
20086
20090
20100
20110
20121
20130
20140
20150
20160
20170
20181
20190
20200
20210
20220
20230
20240
Total19