*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19741
19751
19760
19772
19780
19791
19800
19811
19820
19831
19841
19850
19860
19876
198849
19891
19900
199193
199235
199369
19947
199523
19964
19973
19981
19992
20002
20010
20024
20035
20042
20050
20062
20070
20086
20093
20105
20115
20122
20136
20143
20151
20167
201713
201814
201924
202028
202132
202235
202314
202423
Total538