*Excludes Observations that spanned multiple years

Pre 19703
19700
19711
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19857
198611
198723
198868
19898
199012
199155
199242
199324
199416
199550
199629
199736
199815
199918
200036
200119
200210
200358
200473
200547
200649
200760
200869
200959
201069
201143
201263
201359
201453
201548
201648
201744
201844
201946
202030
202159
202234
202319
202422
Total1581