*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19877
19882
19890
19901
19910
19920
199312
19941
19953
19963
19978
19981
19991
20000
20011
20026
20030
20040
20054
20063
20070
20081
20090
201028
201141
20120
20130
20140
20150
20161
20170
Total125