*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000101
1977000202
1978000000
1979000123
1980000112
1981000213
1982000000
1983000101
1984000000
1985001001
1986000123
1987002024
1988000336
1989000189
199000011213
19910014611
19920004913
19930007714
199400192434
1995000113344
199600274352
19970011297110
199800068793
1999002125670
20000021687105
2001001126780
2002001235882
20030001985104
200400015126141
200500136136173
2006000215475
2007001365996
2008000375794
20090004672118
20100004684130
20110006840108
201200035112147
2013000233154
2014000157186
201500012113
2016000202
2017000000
2018000000
Total001654815332097