*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19871
198810
19891
19900
199138
199213
199320
19944
199524
19962
199711
19980
19994
20002
20016
20026
20030
20040
20050
20062
20071
20088
20095
20102
20113
20120
20130
20142
20150
20160
20170
20184
20197
20202
202121
202214
20232
20240
Total216