*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19941
19951
19962
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20086
20092
20102
20113
20121
20130
20140
20151
20160
20170
20181
20192
20203
20210
20223
20230
20240
Total28