*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19811
19821
19831
19840
19851
19860
19870
19883
19891
19902
199111
19927
199310
19944
19953
19962
19972
19982
19990
20000
20011
20023
20032
20042
20051
20061
20070
20088
20096
201010
20116
20122
201321
20141
20150
20160
20173
20182
20191
20200
20210
20220
Total122