*Excludes Observations that spanned multiple years

Pre 197038
19702
19712
19726
19730
19744
19754
19761
19772
19781
19793
19802
19814
19823
19830
19841
19854
19861
19870
19880
19891
19902
19914
19921
19930
19945
19954
19962
19971
19980
19990
20000
20011
20023
20033
20041
20051
20062
20073
200811
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
Total123