*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000022
1970000000
1971000000
1972000000
1973000000
1974000101
1975000101
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000101
1983000000
1984000000
1985001102
1986000101
1987000202
1988000325
1989000549
199000011011
19910031812
199200263644
199300047781
19940027109118
19950015122128
19960003146149
199700067581
19980003112115
199900044347
20000008112120
200100058489
20020006147153
200300096877
20040013121125
200500067278
200600054045
2007000165470
2008000136578
2009000174057
2010000493887
201100036339
201200021113
201300162633
201400001616
2015000505
2016000134
2017000000
2018000000
Total001124216461899