*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19762
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19876
19887
19890
19903
19912
19920
19933
19941
19953
19962
19974
19982
19993
20003
20011
20021
20030
20040
20050
20061
20071
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total47