*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00002222
Feb00601218
Mar469200102
Apr234741200482
May181946200499
Jun612838000469
Jul1762437100571
Aug19745900485
Sep2244800452
Oct0011200112
Nov00370037
Dec001608399
Total303133279501173348