*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00014142
Feb001011122
Mar00190019
Apr1262400627
May83775425004208
Jun664974449005489
Jul323581271001661
Aug1364200646
Sep0056000560
Oct0017500175
Nov00260026
Dec00220144166
Total10891124223219613641