*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19740
19751
19760
19770
19780
19790
19802
19811
19820
19831
19844
19853
19866
19878
198825
198916
199030
199126
199228
199361
199419
199522
199632
199729
199823
199933
200022
200116
20023
200346
200459
200541
200646
200763
200869
200984
201087
201160
201272
201378
201466
201567
201656
201767
201854
201950
202023
202117
202227
20232
20241
Total1548