*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00001919
Feb000022
Mar00580058
Apr4282500831
May2471716001747
Jun5432232002289
Jul1821440001460
Aug1089700898
Sep1045100452
Oct0012200122
Nov00340034
Dec00704350
Total1021477820647962