*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972001001
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984001001
1985000000
1986000000
1987000000
1988000000
1989001001
1990010001
1991011002
1992001001
1993010001
1994021003
1995011002
1996070007
199701410015
1998000000
1999012003
2000002002
2001013004
2002002002
2003003003
2004002002
200501030013
2006021003
2007022004
2008003003
2009001001
2010014005
2011007007
2012001001
2013020002
2014010001
2015000000
2016020002
2017000000
Total049450094