*Excludes Observations that spanned multiple years

Pre 197020
19700
19710
19721
19731
19740
19751
19762
19774
19787
19794
19800
19813
19821
19830
19842
19851
19861
19872
19880
19891
19901
19913
19922
19934
19945
19957
19969
19973
19981
19994
20000
20016
20021
20031
20041
20051
20060
20070
20080
20091
20103
201114
201215
20132
20142
20151
20160
20170
Total138