*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00014142
Feb001011122
Mar00190019
Apr1262600629
May83775433004216
Jun664974454005494
Jul323581272001662
Aug1364200646
Sep0056000560
Oct0017500175
Nov00270027
Dec00220144166
Total10891124240219613658