*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19872
19883
19890
19902
19910
19920
19931
19941
19950
19960
19970
19980
19993
20000
20010
20020
20030
20041
20050
20060
20071
20086
20090
20100
20110
20120
20130
20141
20150
20160
20171
20180
Total25