*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003333
Feb002068
Mar00170017
Apr01661700633
May02835460003295
Jun203745132003897
Jul3218541629003515
Aug291174700787
Sep142419002424
Oct101014001015
Nov00350035
Dec00200125145
Total8384657092016415804