*Excludes Observations that spanned multiple years

Pre 19702
19701
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19811
19821
19834
19840
19851
198625
19871
19880
198912
19902
19912
19925
19938
19944
199534
19962
199726
19982
19997
20003
200112
200213
20030
200446
200528
20065
200710
200811
20098
201013
201139
20127
201318
20148
201514
201621
201715
20181
Total413