*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19830
19843
19854
19860
19871
19880
19890
19900
19910
19920
19930
19941
19951
19960
19976
19982
19993
20002
20010
20021
20030
20040
20051
20060
20070
20080
20091
20100
20110
20120
20130
20140
20150
20160
20170
Total29