*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0007324331
Feb001172130249
Mar0023000230
Apr0013300133
May633147100808
Jun1414601424002898
Jul158661144002025
Aug6880000814
Sep2362400629
Oct0040400404
Nov0021900219
Dec00593384446
Total4326685625128389186