*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00067480
Feb002312650
Mar12400043
Apr102139600427
May78569700789
Jun162891608001913
Jul4410156900714
Aug121432300349
Sep0826000268
Oct00710071
Nov00350035
Dec00321378411
Total90520405484785150