*Excludes Observations that spanned multiple years

Pre 19701
19701
19710
19721
19730
19741
19750
19760
19770
19780
19791
19800
19810
19821
19831
19840
19850
19863
19871
19880
19892
19901
19913
19920
19932
19943
19951
19960
19971
19982
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20161
20170
Total27