*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19803
19813
19822
19834
19843
19851
19863
19873
19885
19893
19900
19911
19920
19930
19940
19950
19966
19978
19980
19996
20002
20011
200212
20030
20042
20050
20067
20078
20080
20090
20100
20112
20124
20132
20140
20150
20160
20170
Total91