*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003535
Feb00150621
Mar30700073
Apr18657900603
May4791312001368
Jun117221485001624
Jul34994400987
Aug1283800841
Sep5158000586
Oct0022400224
Nov00440044
Dec00904655
Total2254961000876461