*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00014243
Feb001011122
Mar00190019
Apr1262600629
May83778435004221
Jun664968454005488
Jul323581263001653
Aug1363400638
Sep0055200552
Oct0017200172
Nov00270027
Dec00220144166
Total10891094214219713630