*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00026567
Feb001601733
Mar08670075
Apr02914400173
May26163600654
Jun12216267002241
Jul61114646001766
Aug81114500164
Sep00980098
Oct00880088
Nov00660066
Dec00370210247
Total283940141022925672