*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000303
1970000000
1971000101
1972000101
1973000101
1974000000
1975000101
1976000101
1977000303
1978000101
1979000101
1980000101
1981000000
1982000000
1983000000
1984000000
1985000000
1986000202
1987000202
1988000000
1989000202
1990000101
1991000404
1992000101
1993000101
1994000202
1995000000
1996000202
1997000202
1998000505
1999000202
2000000404
2001000000
2002000303
2003000101
2004000101
2005000101
2006000000
2007000000
2008000202
2009000000
2010000101
2011000101
2012000000
2013000000
2014000000
2015000000
2016000000
2017000000
2018000000
Total00054054