*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973002002
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981001001
1982000000
1983000000
1984000000
1985000000
1986004004
1987005005
1988002002
1989001001
1990004004
199100140014
1992002002
1993008008
199400120012
199500100010
1996007007
199700120012
1998006006
199900130013
200000130013
200100140014
200200100010
200300100010
2004009009
2005004004
200600100010
2007007007
200800100010
200900180018
201000120012
201100140014
2012002002
2013003003
2014000000
2015001001
2016000000
2017000000
Total0024000240