*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000101
1978100001
1979000000
1980000000
1981000000
1982000000
1983100001
1984000101
1985000000
1986000112
1987100315
1988100001
1989000303
1990100001
1991003609
19925019217
1993100124
1994101338
1995200518
1996000202
1997100607
1998100607
1999300519
20006013010
20015013211
2002200338
200330011822
20042005310
200540233645
200640141524
20073008011
2008000325
200900113216
201000016218
201101015016
20123009012
2013200103
2014000101
2015000101
2016000101
2017000000
2018000000
Total5311115284301