*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003737
Feb00160622
Mar309700100
Apr19669300718
May49101457001516
Jun123221555001700
Jul35101008001053
Aug1289200895
Sep5159900605
Oct0022800228
Nov00440044
Dec00904655
Total2355165980896973