*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00005353
Feb001501631
Mar6154600553
Apr3322867002902
May271482932003107
Jun721261801001999
Jul49631100366
Aug8247700487
Sep0140100402
Oct0037100371
Nov0014000140
Dec00201109130
Total1653169881117810541