*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970011002
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985010001
1986000000
1987000000
1988000000
1989000000
1990000000
1991001001
1992000000
1993000000
1994010001
1995100001
1996002002
1997020002
1998011002
1999000000
2000001001
2001050005
2002022004
20030570012
200424930054
200502610027
2006022004
2007001001
2008043007
2009000000
2010001001
2011003003
2012010001
2013000000
2014000000
2015000000
2016005005
2017000000
Total31003400137