*Excludes Observations that spanned multiple years

Pre 19708
19700
19711
19720
19731
19740
19751
19761
19770
19780
19790
19802
19810
19820
19830
19842
19851
19861
19871
19881
19890
19902
19911
19920
19931
19940
19953
19965
199710
19982
19994
20002
20010
20025
200310
200431
20051
200684
200713
200810
200914
201024
20115
20122
201311
20142
201548
201612
20173
Total325