*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19751
19761
19770
19780
19790
19800
19810
19820
19830
19844
19852
19861
19873
19883
198915
19901
19919
19924
19931
19940
19951
19965
199720
19980
19991
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20121
20130
20140
20150
20160
20170
20181
20190
20200
20210
20220
Total75