*Excludes Observations that spanned multiple years

Pre 197021
19700
19711
197211
19730
19740
19750
19763
19772
19780
19792
19800
19810
19820
19830
19840
19850
19862
19870
19881
19891
199014
19912
19926
19931
19941
19950
19960
19970
19982
19990
20000
20010
20023
20030
20040
20051
20060
20071
20087
20096
20102
20110
20120
20132
20144
20150
20160
20170
Total96