*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984001001
1985000000
1986000000
1987000000
1988001001
1989000000
1990000000
1991000000
1992000000
1993005005
1994006006
1995008008
1996009009
1997008019
1998004004
1999004015
2000003003
2001004004
2002007007
2003007007
2004004004
2005004026
2006001001
2007002002
2008005005
200900110011
201000130013
201100190019
2012003003
2013002013
2014006006
2015004004
2016000000
2017000000
Total0014105146