*Excludes Observations that spanned multiple years

Pre 197064
197012
19711
19721
19733
19742
19750
19764
19776
197811
197912
198014
198111
19825
198315
19843
19852
19861
19871
19884
19891
19901
19912
19920
19931
19941
19955
19963
199712
19986
19996
20007
20015
20023
20035
200414
200513
200610
20074
200814
200910
201022
20119
20127
201325
201429
201517
20166
20170
Total410