*Excludes Observations that spanned multiple years

Pre 197055
19705
19712
19723
19732
19741
19752
19762
19775
19784
19794
198012
19813
19821
19831
19844
19855
19861
19871
19880
19892
19902
19919
19922
19934
19948
19957
19965
199726
199822
19999
200011
200113
200217
200314
200432
200547
200618
200715
200829
200936
201040
201154
2012106
201335
201433
201549
201620
201729
201816
201928
20207
20219
20228
20235
20248
Total888