*Excludes Observations that spanned multiple years

Pre 19704
19701
19710
19720
19731
19740
19750
19762
19771
19780
19792
19800
19811
19821
19831
19841
19850
19860
19870
19882
19890
19902
19910
19921
19931
19940
19953
19960
19972
19980
19992
20002
20015
20029
200310
200411
20057
20069
200714
20083
20094
20107
201111
20125
20136
20143
20152
20160
20171
Total137