*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0006107113
Feb013233369
Mar04500054
Apr12117100193
May114123400286
Jun145325300320
Jul36136100110
Aug4468700137
Sep2868600120
Oct92870098
Nov12560059
Dec00431373417
Total1441491160105131976