*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00126347374
Feb001575150312
Mar1524600252
Apr141026200286
May171240745002002
Jun1937071420005146
Jul81213801002022
Aug21426100277
Sep01032100331
Oct0222300225
Nov0015800158
Dec001067772885
Total616201470138126912270