*Excludes Observations that spanned multiple years

Pre 19704
19701
19710
19721
19730
19741
19750
19761
19770
19781
19790
19801
19810
19820
19831
19841
19851
19861
19870
19881
19891
19901
19911
19921
19931
19941
19952
19962
19971
19981
19990
20002
20012
20022
20035
20045
20055
20064
20072
20081
20091
20102
20110
20121
20130
20142
20158
20160
20170
20180
Total69