*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000101
1978000000
1979000000
1980000000
1981000000
1982001001
1983000011
1984000000
1985001001
198600203124
198700184123
198800542056
198900525057
199000853088
1991002231742
1992003411752
1993002341340
1994002161340
1995002171442
199600328747
199700655777
199800416754
199900686680
2000005014973
20010040231073
2002004217867
2003006213277
200400227130
200500328242
2006001621331
200700237333
2008001912132
20090067013
201000187429
201100129324
2012004228
20130083314
201400123217
20150074314
201600104418
2017000000
2018000000
Total009412061741321