*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19813
19821
19830
19845
19850
19860
19870
19880
19890
19901
19914
19920
19934
19942
19951
19961
19971
19981
19990
20000
20010
20020
20032
20041
20050
20064
20075
20087
20090
20100
20111
20120
20130
20140
20150
20160
20170
Total44