*Excludes Observations that spanned multiple years

Pre 19701
19702
19710
19720
19730
19740
19750
19762
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19901
199128
19921
19930
19941
19951
19962
19972
19980
19990
20000
20010
20020
20030
20040
20050
20062
20072
20080
20091
20100
20110
20120
20130
20140
20150
20160
20170
Total47