*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000101
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000101
1981000101
1982000101
1983000101
1984000011
1985000101
1986000000
1987000000
1988000101
1989000101
1990000000
1991000000
1992000000
1993000022
1994003137
1995000112
1996001124
19970001910
1998000000
199900001010
200000011011
200100011213
200200021719
200300041317
200400003838
2005000145
20060004812
200700021820
20080002810
2009000415
20100006612
2011000505
2012000235
20130008311
201400114015
2015000909
2016000000
2017000000
2018000000
Total00577169251