*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000101
1982100102
1983000000
1984000000
1985000000
1986000000
1987000011
1988200204
1989000000
1990000000
1991000112
1992000101
1993100001
1994002103
1995000101
1996100001
1997100034
1998100708
1999100102
2000200002
2001100102
2002301206
2003102519
2004100438
2005200057
2006200103
2007100405
2008101406
2009001618
2010101305
2011000404
2012001168
201320272334
201400002929
2015000303
2016000303
2017000011
2018000000
Total250126474175