*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970105006
1970003003
1971000000
1972000000
1973002002
1974000000
1975012003
1976004004
1977006006
1978004004
1979006006
1980107008
1981014005
1982013004
1983001001
1984002002
1985101002
198600100010
198701110012
1988106007
1989112140027
1990431160051
1991316170036
199235270035
1993150270078
19941893700127
1995852240084
1996260230085
199742552300282
199852152300243
199911742400199
200041973500236
200152684100314
200222406700309
200323407100413
200425135900574
2005228412400410
2006427716100442
2007324217000415
2008119518400380
2009620119200399
2010530035000655
2011012428500409
2012329714200442
201315916900229
20140959700192
2015030580088
2016025007
2017001001
Total7746272543007247