*Excludes Observations that spanned multiple years

Pre 19708
19700
19710
19721
19731
19740
19750
19760
19770
19781
19791
19801
19810
19821
19831
19840
19851
19860
19870
19880
19891
19900
19910
19920
19930
19940
19951
19961
19970
19980
19990
20000
20010
20021
20032
20040
20051
20062
20072
20086
20096
20100
20111
20120
20130
20140
20150
20160
20171
20180
Total41