*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00023537
Feb00711018
Mar02150017
Apr320348800694
May143358420003792
Jun814184456004721
Jul291651214001408
Aug1344900453
Sep0037500375
Oct0012000120
Nov00230023
Dec00180130148
Total12879153585317511806