*Excludes Observations that spanned multiple years

Pre 197098
19706
19713
19723
19731
19742
19752
19764
19772
19784
19792
198012
198113
198218
19832
19841
19853
19862
19871
19883
19893
19904
19914
19923
19934
19944
19959
19965
199711
199823
199913
200010
200111
200213
200313
20049
200524
200615
200714
200838
200935
201016
201117
201223
201325
201424
201525
201621
201711
20185
Total614