*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970000000
1971000000
1972001001
1973000000
1974000000
1975001001
1976000000
1977001001
1978001001
1979000000
1980001001
1981001001
1982000000
1983000000
1984000000
1985000000
1986001001
1987000000
1988000000
1989001001
1990001001
1991000000
1992001001
1993002002
1994000011
1995002002
1996001001
1997002002
1998001001
1999000000
2000000000
2001000000
2002001001
2003001001
2004004004
2005001001
2006002002
2007000000
2008002002
2009004004
2010000000
2011002002
2012000000
2013001001
2014000000
2015000000
2016000000
2017000000
Total00380139