*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972001001
1973000000
1974000000
1975000000
1976001001
1977001001
1978000000
1979000000
1980000000
1981000000
1982001001
1983000000
1984000000
1985000000
1986000000
1987001001
1988000000
1989000000
1990001001
1991001001
1992000000
1993001001
1994001001
1995000000
1996001001
1997002002
1998003003
1999002002
2000002002
2001003003
2002001001
2003000000
2004001001
2005001001
2006000000
2007003003
2008000000
2009000000
2010004004
2011002002
2012000000
2013000000
2014000000
2015001001
2016000000
2017010001
Total01350036