*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00004040
Feb011101628
Mar00290029
Apr11111265001287
May649652889003603
Jun7271281906002761
Jul12801363272004688
Aug199211231001451
Sep71248900562
Oct3061200615
Nov1024300244
Dec0024084108
Total294136411971014015416