*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0002811581186
Feb014197401828
Mar32062565002774
Apr158504684005549
May153141819460015280
Jun3603094513400032645
Jul290647279150014677
Aug62493076003187
Sep6122240002258
Oct001085001085
Nov0029800298
Dec00172011431315
Total889527162474035270281082