*Excludes Observations that spanned multiple years

Pre 19701
19702
19710
19720
19730
19740
19750
19761
19770
19781
19790
19801
19810
19822
19832
19841
19851
19865
198715
198849
198916
199036
199168
199225
199322
199433
199559
199616
199748
199816
199918
20005
20014
20024
200311
200413
200512
200613
20073
200814
200910
20101
20110
20122
20130
20140
20151
20163
20170
Total534