*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00005353
Feb001701734
Mar6155000557
Apr3322885002920
May271482945003120
Jun731261802002001
Jul49631100366
Aug8247900489
Sep0140100402
Oct0037100371
Nov0014000140
Dec00201109130
Total1663169921117910583