*Excludes Observations that spanned multiple years

Pre 19707
19700
19710
19721
19731
19740
19750
19761
19770
19780
19790
19802
19810
19821
19831
19840
19850
19861
19870
19881
19891
19903
19913
19920
19932
19940
19954
19961
19973
19981
19997
20002
20012
20023
2003276
200415
2005111
200614
200710
20086
2009120
201013
20112
20121
20134
20141
20153
20169
201732
201829
Total694