*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19742
19751
19760
19770
19780
19791
19801
19810
19820
19832
19840
19852
19860
19870
19880
19891
19901
19910
19921
19930
19941
19951
19960
19970
19980
19991
20000
20011
20020
20030
20040
20050
20060
20070
20082
20093
20102
20111
20123
20131
20140
20152
20161
20170
20180
20192
20205
20217
20226
20238
20245
Total64