*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000101
1970000000
1971000101
1972000202
1973000101
1974000101
1975000000
1976000101
1977000101
1978000000
1979000000
1980000000
1981000000
1982000101
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993000101
1994000202
1995000000
1996000101
1997000000
1998000000
1999000000
2000000101
2001000000
2002000000
2003000202
2004000202
2005000202
2006000303
2007000000
2008000101
2009000000
2010000000
2011000000
2012000000
2013000000
2014000000
2015000000
2016000000
2017000000
2018000000
Total00024024