*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0001318319
Feb20115095212
Mar541322001331
Apr1202432002453
May81642375002547
Jun491872208002444
Jul681544000523
Aug18230900329
Sep1057900580
Oct0069700697
Nov0045500455
Dec001040525629
Total15239211036193812519