*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00023537
Feb00711018
Mar02150017
Apr220448800694
May143359424003797
Jun664199458004723
Jul271671214001408
Aug1345300457
Sep0037600376
Oct0012000120
Nov00230023
Dec00180130148
Total11079343596317511818