*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003737
Feb00160622
Mar30960099
Apr18669200716
May49101456001515
Jun123221555001700
Jul35101004001049
Aug1288300886
Sep3159800602
Oct0022800228
Nov00430043
Dec00904655
Total2325165800896952