*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00013917930
Feb013714384760
Mar2221550001574
Apr3412279002323
May166403149006568
Jun79198102400020129
Jul55864325080011206
Aug29211326001376
Sep151488001494
Oct011343001344
Nov0057400574
Dec0124919561207
Total185349481207718225749485