*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973001001
1974001001
1975000000
1976000000
1977000000
1978000000
1979002002
1980000000
1981002002
1982001001
1983000000
1984000000
1985001001
1986001001
1987001001
1988001001
1989001001
1990000000
1991000000
1992003003
1993001001
1994004004
199500100010
1996002002
1997009009
1998002002
1999006006
2000001001
2001007007
200200150015
2003004004
2004006006
2005002002
2006002002
2007005005
2008008008
2009003003
2010009009
201100220022
2012003003
2013003003
2014001001
2015000000
2016000000
2017002002
Total0014200142