*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan370001552
Feb220049273
Mar0004311611204
Apr0001961092011116
May0021140757918
Jun007425231357
Jul008515113249
Aug00211804205
Sep0081042114
Oct00070070
Nov00048048
Dec341022057
Total93120912551290514463