*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970001001
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979110002
1980000000
1981001001
1982001001
1983001001
1984001001
1985001001
1986001001
1987001001
1988001001
1989001001
1990000000
1991000000
1992001001
1993000000
1994032005
1995002002
1996021003
1997022004
1998061007
1999053008
2000021003
2001072009
200204820050
200303120033
200403300033
2005061007
200607020072
200708120083
200825810061
200901600016
2010071008
2011081009
201242600030
201301720019
20141116700124
2015132006
2016014005
2017000000
2018000000
Total95495200610