*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19761
19770
19780
19792
19802
19811
19822
19832
19841
19851
19860
19871
19880
19891
19901
19912
19920
19937
19941
19951
199611
19976
19981
19992
20006
20011
20020
20030
20040
20051
20061
20070
20082
20090
20106
201120
20125
201321
201414
201530
201632
201735
201839
20199
20200
Total268