*Excludes Observations that spanned multiple years

Pre 197027
19701
19714
19721
19731
19740
19750
19762
19771
19780
19791
19800
19810
19820
19831
19840
19850
19860
19870
19880
19892
19901
19913
19922
19932
19941
19953
19962
19970
19983
19990
20000
20010
20020
20031
20040
20050
20060
20071
20080
20090
20100
20110
20120
20130
20140
20150
20160
20172
20180
Total62