*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000011
1970000000
1971000000
1972000000
1973000000
1974000011
1975000000
1976000011
1977000011
1978000000
1979000000
1980001001
1981000000
1982001012
1983000000
1984001001
1985000000
1986000000
1987101013
1988001012
1989000101
1990001001
1991001001
1992000000
1993010001
1994060006
1995042017
1996030003
1997002002
1998040015
1999001012
2000034007
20011430210
200201840224
20030960015
20040980219
2005061029
2006023038
20070850619
20080440210
200913110015
201005100015
20110470011
2012021047
2013042006
2014030003
2015014005
2016012003
2017001001
Total310488133229