*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0004748974944
Feb021748416583412
Mar14183523003555
Apr35203525003580
May7012546055007379
Jun49373775420011328
Jul2012194146005385
Aug3142183002200
Sep2102271002283
Oct022070002072
Nov001687001687
Dec00881727223610
Total19362763563158927751435