*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00015051
Feb001001828
Mar00220022
Apr02230025
May332415600483
Jun201157554001731
Jul2041642300859
Aug162139400431
Sep3121510220
Oct01370038
Nov00290029
Dec00260300326
Total621922188923684243