*Excludes Observations that spanned multiple years

Pre 197011
19700
19710
19720
19730
19740
19750
19760
19771
19780
19791
19803
19810
19821
19833
19842
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19992
20001
20010
20022
20030
20040
20054
20061
200713
20082
20095
20102
20110
20120
20130
20140
20150
20160
20170
Total54