*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19741
19751
19760
19770
19782
19790
19800
19810
19824
19831
19840
19850
19860
19870
19880
19891
19902
19911
19921
19930
19941
19950
19966
19970
19981
19993
20000
20011
20020
20030
20040
20050
20060
20070
20084
20092
20100
20111
20121
20132
20142
20150
20161
20171
20181
20190
20200
Total42