*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0002331723195
Feb231133511192262
Mar6303509003545
Apr181185538005674
May1193358373008827
Jun2984506932007680
Jul293432145002481
Aug62102119002191
Sep891898001915
Oct011792001793
Nov011556001557
Dec00701525713277
Total80610003569633686244397