*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000202
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000101
1981000101
1982000101
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993000000
1994000000
1995000101
1996000000
1997000101
1998000000
1999000202
2000000000
2001000101
2002000202
2003000101
2004000000
2005000000
2006000000
2007000505
2008000202
2009000101
2010000101
2011000101
2012000000
2013000000
2014000101
2015000101
2016000000
2017000000
2018000000
Total00025025