*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00014142
Feb001011122
Mar00190019
Apr1262500628
May83775427004210
Jun664974449005489
Jul323581271001661
Aug1364200646
Sep0056000560
Oct0017500175
Nov00270027
Dec00220144166
Total10891124227219613645