*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19864
19871
19880
19890
19901
19910
19923
19930
19940
19951
19962
19977
19980
19991
20002
20010
20020
20030
20040
20050
20060
20070
20084
20090
201040
201115
20121
20131
20141
20150
20160
20170
Total85