*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000022
1970000000
1971000000
1972000000
1973000000
1974000011
1975000000
1976001001
1977000000
1978000000
1979001001
1980000000
1981000011
1982000000
1983000000
1984000000
1985000000
1986000000
1987002013
1988002002
1989001001
1990002002
1991004004
1992005005
1993001001
1994003003
199500120012
1996005005
1997002013
1998001001
1999001001
2000005005
2001007007
2002008008
2003002002
2004006006
2005001001
2006002013
2007003014
2008004015
2009007007
2010006006
2011005005
2012002002
2013000000
2014000000
2015000000
2016002002
2017000000
Total0010309112