*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
19888
19896
19901
19912
19925
199313
19942
199525
19960
19972
19980
19993
20001
20011
20023
20030
20040
20050
20062
20070
20082
20093
20104
20115
20120
20130
20140
20153
20161
20171
20180
20190
20200
Total95