*Excludes Observations that spanned multiple years

Pre 197024
19700
19710
19722
19731
19740
19753
19760
19771
19781
19792
19801
19811
19820
19830
19841
19851
19861
19870
19882
19891
19908
19916
19925
19932
19944
19951
19964
199717
19982
19992
20002
20011
20021
20031
20040
20050
20062
200711
2008100
2009275
201034
2011132
2012155
2013266
2014445
2015376
2016366
201751
20181
20190
Total2312