*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19751
19760
19770
19781
19790
19800
19811
19821
19831
19841
19851
19869
198718
198841
198919
199011
19918
199227
199334
199416
199511
199611
199729
199810
19996
20001
20012
200214
20036
200429
200512
20065
20075
200812
20090
201011
20118
20122
20130
20140
20151
20162
20170
Total368