*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000011
1970000000
1971000000
1972000011
1973000000
1974000000
1975000011
1976000022
1977000000
1978000011
1979001012
1980000011
1981002024
1982000000
1983000011
1984000000
1985000011
1986000011
1987000000
1988001001
1989000011
1990000033
1991001001
1992000011
1993000022
1994002024
1995002035
1996001012
1997004026
1998003025
1999001012
2000002024
2001002013
2002004026
2003001012
2004000022
2005001012
2006004004
2007003014
2008002046
2009004015
2010002013
2011006028
2012001012
2013010001
2014000000
2015002002
2016001001
2017000000
Total0153050104