*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003333
Feb0180615
Mar00240024
Apr10121041001063
May1552181041001414
Jun976876200927
Jul4372611167001865
Aug523354100626
Sep20430700331
Oct1149900501
Nov0016900169
Dec002006888
Total772598557901077056