*Excludes Observations that spanned multiple years

Pre 197068
19704
197111
197213
19735
197413
19755
197616
197714
19782
197931
198058
198142
198227
198312
198418
198510
19866
19874
198821
198925
199030
199131
199226
199388
199473
199559
199643
199742
199853
199959
200088
200180
2002111
200340
200423
200539
200636
200719
200859
200967
201075
201176
201263
2013285
201478
201547
201635
20177
20189
Total2146