*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0004397401
Feb001194158281
Mar03726700304
Apr740148200890
May1243131700760
Jun4252640600974
Jul456625800369
Aug14932600349
Sep3337600382
Oct0533900344
Nov0233200334
Dec001050529634
Total12314803327810846022