*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan013727291356
Feb20167389261
Mar6546300474
Apr176387200952
May782571434001769
Jun1493942118002661
Jul1254154600712
Aug261053600572
Sep51150500521
Oct0038800388
Nov0028800288
Dec0011759051027
Total40878274713512859981