*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19733
197422
197527
197616
19773
197811
197910
19808
19817
19826
198315
198433
198519
198610
19879
19888
19899
19908
19915
19927
19936
19947
19958
199612
19977
199812
199916
200014
20018
200214
200313
200413
200514
200618
200717
200815
200918
201023
201124
201215
201312
201413
201522
20161
20170
20180
Total559