*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002507
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000202
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000101
1986000101
1987000404
1988000101
1989000303
1990000404
1991000404
1992000303
1993000707
1994000415
1995000202
1996000808
1997000505
1998000404
1999000202
2000000617
2001000505
2002000909
2003000314
2004002619
2005000404
2006001304
2007000505
2008000808
2009000415
2010000404
2011001506
2012001012
2013000000
2014000000
2015000000
2016000000
2017000000
2018000000
Total0071226135