*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979002002
1980000000
1981000000
1982000000
1983000000
1984000000
1985001001
1986002002
1987003003
1988005005
1989002002
1990003003
1991009009
1992007007
1993002002
1994004004
199500150015
1996009009
1997007007
199800200020
1999008008
200000340034
200100340034
200200300030
200300340034
2004008008
200500170017
200600110011
200700140014
200800130013
200900110011
2010007007
201100150015
201200170017
201300190019
201400270027
201500420042
201600390039
201700500050
201800670067
201900520052
2020000000
2021000000
2022000000
Total0064000640