*Excludes Observations that spanned multiple years

Pre 197022
19708
19711
19721
19733
19740
19752
19762
19772
19782
19793
198015
19813
19822
19830
19840
19850
19860
19870
19880
19890
19900
19911
19921
19931
19942
19951
19960
19971
19980
19991
20001
20010
20023
20036
200428
20058
20063
20071
200810
20091
20100
20110
20120
20131
20140
20150
20160
20170
Total136