*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
200718
200858
200966
201074
201168
201259
2013280
201473
201544
201631
20173
Total2100