*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00013123136
Feb013724383
Mar08790087
Apr07116800239
May01261331001592
Jun184253394004665
Jul171370261001648
Aug51519900219
Sep1812400133
Oct01720073
Nov00400040
Dec00455645695
Total4169881750208119610