*Excludes Observations that spanned multiple years

Pre 1970112
19702
19710
19721
19732
19744
19751
19761
197717
19786
19792
19805
19810
19820
19830
19840
19850
19861
19870
19880
19890
19901
19910
19920
19930
19940
19950
19962
199770
1998160
1999472
2000128
200138
200228
200334
200448
200511
2006176
20071875
2008718
2009134
20101215
20111147
2012293
201366
2014237
201531
20163034
20179
Total10081