*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00004040
Feb011101628
Mar00270027
Apr3141145001162
May1402231304001667
Jun113651127001305
Jul4922611735002488
Aug7541939001055
Sep31442700462
Oct2060300605
Nov1023700238
Dec0024084108
Total857609757901409185