*Excludes Observations that spanned multiple years

Pre 197048
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19801
19812
19823
19832
19840
19850
19860
19871
19880
19891
19902
19913
19922
19938
199411
199514
19969
199710
19986
19998
20004
20017
20027
200312
20046
20057
20068
20074
20087
20094
20107
201111
201221
201316
201410
201519
201617
201713
201826
201923
202032
202133
202230
202329
20249
Total494