*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19885
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20011
20020
20030
20040
20050
20060
20070
20080
20090
201011
20116
20120
20132
20140
20152
20167
20171
201826
20191
20200
20211
20220
20230
20240
Total64