*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19868
19870
19882
19890
19900
19910
19921
19930
19941
19950
19961
19970
19980
19990
20000
20010
20020
20030
20040
20055
20062
20070
20087
20090
201045
201115
20121
20132
20140
20150
20160
20170
Total90