*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000402327
1970006028
1971001067
1972000033
1973000033
1974001034
1975003014
1976003069
19770150410
1978002046
19790050510
19800170311
19810150410
19820140611
1983002057
19840050813
1985011068
198611110518
198700110415
19880050712
198925130525
1990437150460
1991319210245
1992314150436
1993345270479
199411515004206
199581081504135
19969762905119
199784563807509
199863162805355
199932592305290
200013503008389
200163304905390
200213006705373
2003142010204527
200474356809519
2005036110806475
2006534611106468
2007031511504434
2008017418505364
2009316118403351
2010619026900465
2011111631601434
201213309505431
201308616700253
201402416000184
2015017330050
2016052007
2017001001
Total835452241702188170