*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972000000
1973000000
1974001001
1975000000
1976001001
1977000000
1978001001
1979002002
1980000000
1981000011
1982002002
1983001001
1984100001
1985000000
1986000000
1987001001
1988116008
1989002002
1990100001
1991113005
1992005005
1993102003
1994205007
1995203005
1996006006
1997114006
1998004004
1999003003
2000205007
2001203016
2002301004
2003000000
2004001001
2005002002
2006003003
2007000000
2008000000
2009003003
201010110113
2011103004
2012001001
2013001001
2014000000
2015102003
2016003003
2017000000
Total2039203118