*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000101
1989000000
1990000000
1991000000
1992000101
1993000000
1994000000
1995000101
1996000000
1997000202
1998000202
1999000000
2000000101
2001000303
2002000404
2003000202
2004000112
2005000101
2006000101
2007000606
2008000202
2009000101
2010000505
2011000101
2012000000
2013000000
2014000000
2015000000
2016000101
2017000101
2018000000
Total00137139