*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001506
1970000303
1971000000
1972000000
1973000202
1974000000
1975000213
1976000404
1977000606
1978000404
1979000606
1980001708
1981000415
1982000314
1983000101
1984000202
1985001102
198600010010
198700011112
1988001607
1989001141227
1990004163151
1991003171636
199200327535
1993001275078
19940013789127
1995008245284
1996002236085
199700423255282
199800523215243
199900124174199
200000435197236
200100541268314
200200267240309
200300271340413
200400259513574
2005002124284410
2006004161277442
2007003170242415
2008001184195380
2009006192201399
2010005350300655
2011000285124409
2012003142297442
201300116959229
20140009795192
2015000583088
2016000527
2017000101
2018000000
Total0077254346277247