*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000404
1970000101
1971000000
1972000000
1973000303
1974000303
1975000000
1976000000
1977000101
1978000000
1979000000
1980000000
1981000101
1982000000
1983000000
1984000000
1985000000
1986000101
1987000000
1988000505
1989000101
1990000000
1991000101
1992000303
1993000101
1994000404
1995000101
1996000202
1997000606
1998000202
1999000606
2000000101
2001000101
2002000303
2003000303
2004000404
2005000404
2006000505
2007000707
2008000404
2009000707
2010000202
2011000303
2012000101
2013000101
2014000000
2015000000
2016000000
2017000000
2018000000
Total00092092