*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
19870
19884
19890
19902
19918
199216
199316
19941
19954
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20063
20071
20080
20090
20101
20111
20120
20130
20140
20150
20160
20172
20182
20190
20200
20210
20220
20230
20240
Total61