*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000110011
1970003003
1971002002
1972000000
1973005005
1974001001
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985001001
1986001001
1987001001
1988003003
1989000000
1990002002
1991004004
1992002002
1993002002
1994009009
1995001023
1996001001
1997002002
1998004004
1999001001
20000081110
200100110112
2002003003
200300100010
2004002002
2005003003
2006001001
2007000000
2008003014
2009000000
2010001001
2011003003
2012004004
2013002002
2014000000
2015001001
2016000000
2017000000
Total0010815114