*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100405
1970000000
1971000000
1972000000
1973000000
1974000000
1975000303
1976000202
1977000606
1978000101
1979000336
1980000134
1981000101
1982000505
1983000101
1984000202
1985001012
1986000426
1987000358
1988000617
198900010616
199000292132
1991007181136
199200271322
1993003165877
199400322168193
19950021191104
1996001010121141
199700716484507
199800220504526
199900211274287
200000226444472
200100117399417
200210042364407
200300441417462
200400123541565
200500081432513
200600253448503
200700072448520
2008000107182289
2009000113114227
2010001160236397
2011000233281514
2012000102475577
201300092263355
201400018167185
201500016218
2016000077
2017000000
2018000000
Total2052138869868428