*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970420102054
1970100001
1971300003
1972400015
1973500106
1974400206
1975400004
19768003011
1977902014245
197880527774
19791006811392
198070354551
1981120194338
1982130164336
1983100378560
1984130363254
1985110731031
198615056834
1987140311129
19881502414558
198914088030
19901712419768
19911102229769
19921401530362
19931712033475
19941502055999
1995140148770
1996100347767
1997170347572
19981604461076
19991507786106
2000190860390
2001190742573
2002130950173
20031501251280
20041901230364
2005170236358
2006141436156
2007234255185
2008213442171
2009100271588
201050349259
20116011117125
2012240339167
201320038141
201400016218
201520114118
2016200417
2017102306
2018000000
Total5801053112841602565