*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan015003752
Feb024902273
Mar0116143001204
Apr0109201960011116
May2175714000918
Jun743125200357
Jul851315100249
Aug21418000205
Sep8210400114
Oct00700070
Nov00480048
Dec002213457
Total20912905125519314463