*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19863
19870
19886
19892
19901
19910
199212
19934
19943
19950
19960
19971
19980
19993
20002
20011
20020
20030
20040
20050
20061
20070
20081
20090
20101
20110
20120
20130
20141
20150
20162
20170
20180
20190
Total45