*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000101
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000112
1982000202
1983000000
1984000000
1985001012
1986000101
1987000224
1988000246
1989000314
19900001910
1991002349
199200112931
199300033841
199400073845
1995000102737
199600002929
199700063339
199800033942
199900061622
200000173745
200100081624
200200073441
2003001104758
200400065662
200500016970
200600074855
2007000215677
2008000134861
200900213722
2010000352257
2011000311041
2012001251440
2013000235
2014000167
2015000819
2016000000
2017000000
2018000000
Total0092477451001