*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000000
1986000000
1987000101
1988000202
1989001102
1990001102
1991001326
1992000213
1993001528
1994000404
1995000808
1996000202
1997000303
1998000112
1999000606
2000000606
200100010111
200200011011
200300110213
2004000426
2005000707
200600011011
200700013013
200800011011
200900012012
201000116017
201100022022
2012000101
2013000314
2014000000
2015000000
2016000101
2017000000
2018000000
Total00617712195