*Excludes Observations that spanned multiple years

Pre 19700
19702
19710
19721
19730
19740
19750
19760
19770
19780
19790
19802
19810
19820
19830
19840
19850
19861
19870
19889
198923
199020
199132
199232
199347
19948
199543
199610
199741
199832
19996
200021
20018
200216
200345
200439
200564
200635
200745
200851
200951
201066
201192
201291
2013100
201497
201590
201683
201784
20180
Total1387