*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000101516
1970000022
1971001056
1972001045
1973001034
1974001034
1975001023
1976002068
19770050813
1978001045
1979002057
19800050510
19810010910
198200401014
1983003069
19841020710
19850030811
19861170716
198700100919
1988112001638
198901130923
1990001701229
199116300643
1992221501332
199310280736
1994033701454
1995134301360
1996133401351
1997222501746
1998223801254
1999001801129
2000013601855
2001103401752
2002003401044
2003124101357
2004002601844
2005001502540
2006002502348
2007003612057
2008013111649
2009045001064
201022651676
201110128113143
2012012811444
201303300336
201406180125
201500140216
2016001023
2017001023
Total184498254741523