*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19741
19750
19761
19770
19781
19790
19800
19810
19821
19830
19840
19850
19860
19870
19880
19891
19908
19919
19924
19931
19943
19952
19960
19970
19980
19990
20000
20011
20020
20031
20044
20050
20060
20070
20080
20090
20100
20112
20120
20130
20140
20150
20166
20172
20180
20190
20200
Total50