*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003636
Feb00160622
Mar30960099
Apr18669200716
May49101455001514
Jun123221552001697
Jul35111001001047
Aug1287800881
Sep3159600600
Oct0022800228
Nov00430043
Dec00804654
Total2325265650886937