*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00004747
Feb001601733
Mar6037800384
Apr3302460002493
May251472821002993
Jun661261786001978
Jul49630100356
Aug8245100461
Sep0137700378
Oct0035700357
Nov0013800138
Dec00201109130
Total157312910511739748