*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
19880
19890
19902
19910
19922
19932
19941
19951
19962
19974
19985
19992
20003
20018
20023
200322
200416
20059
200617
20075
200811
20092
20105
20111
20127
20131
20140
20150
20160
20170
Total131