*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0008134923573
Feb091241612292485
Mar91272246002382
Apr83372097002442
May224742391005155
Jun736397407006877
Jul4514942568004107
Aug7321897001936
Sep171635001643
Oct011402001403
Nov031102001105
Dec00542824813031
Total165131491552895720236139