*Excludes Observations that spanned multiple years

Pre 197058
19701
19718
19721
19731
19746
19751
19760
19773
19780
19790
19800
19811
19822
19830
19841
19852
19860
19870
19882
19890
19900
199113
19920
19930
19942
19950
19961
19971
19982
19991
20002
20010
20022
20032
20041
20051
20062
20071
200810
20090
20101
20110
20120
20130
20141
20150
20160
20170
20180
Total130