*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00068389
Feb012833264
Mar02480050
Apr12016600187
May114122700279
Jun135024700310
Jul35136100109
Aug4468400134
Sep2868400118
Oct92850096
Nov12540057
Dec00291250280
Total1421431113103651773