*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00008383
Feb001512238
Mar06710077
Apr212840800538
May4855284001143
Jun12873220001105
Jul118543900535
Aug4323700244
Sep0321000213
Oct0013100131
Nov00430043
Dec00250220245
Total331953208313254395