*Excludes Observations that spanned multiple years

Pre 19703
19702
19719
19721
19731
19743
19751
19761
19771
19782
197911
198017
198113
19826
198312
198411
19854
19862
19872
19884
19892
19903
19914
19926
19937
19941
19953
19965
199712
199814
199921
200029
200134
200230
200314
200421
20055
200622
200712
200817
200922
201022
201124
201224
201320
201417
201521
201612
201712
201810
Total552