*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0000197197
Feb0071072143
Mar2198500988
Apr261224001232
May1491731001754
Jun78412729002848
Jul1491366001389
Aug1179200794
Sep2069500697
Oct0067500675
Nov0033700337
Dec00590199258
Total1136710664046811312