*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00002323
Feb004015
Mar00700070
Apr4297900985
May2661980002012
Jun5422329002385
Jul1921523001544
Aug6086200868
Sep1046900470
Oct0014700147
Nov00450045
Dec001003949
Total1101284180638603