*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19885
19890
19901
199113
19921
19930
19941
19952
19962
19972
19980
19991
20000
20010
20020
20030
20040
20050
20063
20071
20088
20090
20105
20116
20120
20130
20145
20150
20160
20170
Total56