*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00067480
Feb002312650
Mar12400043
Apr102140300434
May78571000802
Jun162911622001929
Jul4510157100717
Aug121433700363
Sep0826400272
Oct00710071
Nov00350035
Dec00321378411
Total91522410884785207