*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19860
19870
19882
19890
19901
19910
19923
19931
19942
19951
19960
19970
19980
19990
20000
20010
20021
20030
200410
20050
20060
20070
20080
20090
20101
20112
20120
20130
20140
20150
20160
20172
20180
20190
20200
20210
20220
20231
20240
Total29