*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000101
1970000101
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000101
1979000101
1980000202
1981000202
1982000404
1983000000
1984000000
1985001001
1986000011
1987000213
1988000112
1989000167
1990000167
199100161118
1992001359
199300001818
199400474657
1995001112739
199600224549
19970029105116
199800047781
199900064652
2000001165572
2001000105969
2002000226587
200300120181202
200400016345361
200500014188202
20060003494128
20070005089139
200800039311350
2009001335286
201000067119186
2011000711081
2012000296897
2013000184361
2014000233659
201500012517
2016000112
2017000011
2018000000
Total001554021172672