*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
199172
19920
19930
19941
19954
19960
19970
19980
19991
20000
20010
20020
20030
20040
20050
20060
20070
20081
20090
20100
20110
20121
20130
20140
20150
20160
20174
20181
201911
20204
20216
20220
20239
20240
Total117