*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000101
1970000000
1971000000
1972000101
1973000000
1974000000
1975000000
1976000101
1977000202
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000202
1987000000
1988000101
1989000101
1990000606
1991000404
1992000303
1993000000
1994000404
1995000404
1996000202
1997000202
1998000303
1999000101
2000000606
2001000808
2002000303
2003000505
2004000505
2005000505
2006000202
2007000303
2008000303
2009000303
2010000303
2011000707
2012000000
2013000000
2014000101
2015000101
2016000000
2017000000
2018000000
Total00093093