*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19731
19740
19751
19760
19770
19781
19791
19800
19810
19820
19831
19841
19851
19869
19878
198820
19891
19901
199117
199211
199314
19943
19955
199610
19974
19981
19993
200015
20014
20025
20030
20040
20054
20067
20072
20083
200910
20103
20112
20123
201330
20142
20152
20166
201714
201820
201934
202033
202160
202258
202373
202442
Total549