*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000303
1970000000
1971000000
1972000000
1973000101
1974000000
1975000000
1976000000
1977000202
1978000202
1979000000
1980000101
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000101
1992000101
1993000000
1994000101
1995000202
1996000101
1997000101
1998000202
1999000101
2000000000
2001000000
2002000202
2003000101
2004000303
2005000303
2006000000
2007000202
2008000213
2009000000
2010000202
2011000101
2012000000
2013000000
2014000000
2015000000
2016000000
2017000000
2018000000
Total00035136