*Excludes Observations that spanned multiple years

Pre 19700
19703
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19831
19840
19850
19860
19870
19880
19891
19902
19910
19922
19935
19941
19952
19965
19973
19980
19991
20000
20010
20022
20030
20042
20052
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total33