*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19841
19850
19862
19870
19880
19891
19900
19910
19921
199311
19941
19953
19961
19970
19980
19990
20000
20010
20021
20030
20045
20050
20060
20072
20082
20091
20100
20110
20120
20130
20140
20150
20160
20170
Total35