*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00003333
Feb0180615
Mar00240024
Apr10121041001063
May1552171040001412
Jun966876200926
Jul4372611166001864
Aug523354100626
Sep20430700331
Oct1149900501
Nov0016900169
Dec002006888
Total771597557701077052