*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19811
19820
19830
19840
19850
19860
19870
19881
19890
19900
19910
19920
19930
19940
19953
19960
19970
19980
19993
20000
20010
20020
20030
20040
20050
20060
20070
20080
20092
201013
20116
20125
20130
20144
20150
20165
20171
20182
20196
20208
20215
202214
20230
20240
Total80