*Excludes Observations that spanned multiple years

Pre 1970120
197016
19710
19721
19730
19743
19759
19767
19775
19786
19799
198022
19811
19821
19831
19841
19852
19861
19871
19881
19891
19901
19911
19921
19933
19943
19954
19963
19973
19983
199911
20002
20014
20024
20036
200452
200512
200629
20072
200823
200926
201025
201127
201232
201340
201429
20152
20161
20171
Total558