*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00016768
Feb002301639
Mar07920099
Apr01028400294
May610460200712
Jun48189812001049
Jul531917200244
Aug939300105
Sep1210100104
Oct0013400134
Nov00650065
Dec00400306346
Total117334241813893259