*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19884
19890
19901
19910
19921
19932
19941
19956
19962
199718
19987
19991
20004
20011
20020
20030
20040
20053
20061
20070
20082
20090
20102
20111
20120
20130
20145
20150
20162
20170
Total65