*Excludes Observations that spanned multiple years

Pre 19708
19701
19710
19722
19736
197424
197531
197622
19776
197812
197910
19809
19817
19826
198316
198431
198518
19869
19879
19888
198912
199019
19918
19927
199310
199413
199519
199615
199715
199821
199926
200021
200122
200244
200344
200420
200533
200621
200736
200840
200951
201072
201187
201289
201382
201493
2015120
201650
20170
20180
Total1325