*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197023004027
1970200608
1971600107
1972300003
1973300003
1974300104
1975100304
1976600309
19774005110
1978400206
19795005010
19803007111
19814005110
19826004111
1983500207
19848005013
1985600118
198650111118
198740011015
19887005012
198950213525
1990404153760
1991203211945
1992403151436
1993403274579
199440150151206
199540815108135
19965092976119
199770838456509
199850628316355
199950323259290
200080130350389
200150649330390
200250167300373
2003401102420527
200490768435519
2005600108361475
2006605111346468
2007400115315434
2008500185174364
2009303184161351
2010006269190465
2011101316116434
201250195330431
201300016786253
201400016024184
2015000331750
2016000257
2017000101
2018000000
Total218083241754528170