*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19860
19870
198818
19890
19903
19911
19920
19932
19941
19950
19962
19974
19980
19991
20000
20011
20024
20032
20041
20050
20061
20070
20080
20090
20101
20110
20120
20130
20140
20150
20162
20170
Total45