*Excludes Observations that spanned multiple years

Pre 197012
19702
19711
19722
19732
19740
19750
19761
19770
19780
19794
19801
19812
19820
19832
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19941
19954
19960
19970
19980
19990
20000
20010
20020
20030
20042
200514
20060
20070
20086
20091
20100
20110
20121
20130
20140
20150
20160
20170
Total58