*Excludes Observations that spanned multiple years

Pre 1970215
197029
19712
19723
19732
19740
19754
19761
19772
197811
197918
198013
19814
19821
19831
19842
19851
19861
19871
19882
19891
19902
19911
19923
19935
19946
19956
19967
199710
19985
199913
20005
20015
20025
20034
20047
200515
200612
20074
2008123
2009174
2010110
2011112
2012166
2013174
2014141
201526
20166
201710
Total1471