*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974001001
1975000000
1976000000
1977000011
1978000000
1979000000
1980000000
1981001001
1982010001
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989002002
1990001001
1991000000
1992003003
1993002002
1994002002
1995003003
1996008008
1997005005
1998002002
1999004004
2000002002
2001006006
200200100010
2003003003
200400110011
2005001001
2006005005
200700100010
2008009009
200900110011
201011130015
201100130013
2012002002
2013001001
2014000000
2015003003
2016001001
2017000000
Total1213501139