*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
197712
19789
19790
19809
198110
198210
198325
19844
198511
19860
19875
198810
198912
199011
19913
199234
199329
199416
199520
199621
199720
199821
199918
200022
200119
200230
200323
200455
200573
2006114
2007190
2008115
2009170
2010166
201185
201283
201389
20141
20150
20160
20170
Total1546