*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970005005
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979002002
1980000000
1981000000
1982000000
1983001001
1984000000
1985001001
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992001001
1993000000
1994000000
1995002002
1996003003
1997001001
1998008008
1999001001
2000000000
2001001001
2002000000
2003000000
2004005005
2005003003
2006002002
200700100010
2008008008
2009000000
2010001001
2011003003
2012000000
2013000000
2014000000
2015001001
2016000000
2017000000
Total00590059