*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19862
19875
19883
19890
19900
19913
19920
19931
19941
19956
19960
19975
19980
19993
20002
20016
20024
20030
20040
20050
20064
20072
20081
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total51