*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
19875
19882
19891
19902
19918
19924
19936
19941
199517
19960
19971
19981
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20101
20110
20120
20131
20140
20150
20160
20170
20180
20190
20200
20212
20220
20235
20243
Total60