*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19741
19750
19760
19770
19780
19792
19800
19810
19820
19830
19840
19851
19860
19870
19880
19891
19902
19910
19920
19931
19940
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20061
20070
20080
20091
20101
20110
20120
20130
20140
20150
20160
20170
20181
20190
20201
20213
20220
20236
20240
Total22