*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00013188201
Feb1183158144
Mar01940095
Apr1114200144
May42826400296
Jun1219279000994
Jul103025000290
Aug2917600187
Sep3514100149
Oct00830083
Nov0010400104
Dec00694666739
Total332672196189123426