*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00029181210
Feb0180242125
Mar0312800131
Apr6612500137
May136718800268
Jun1339621900628
Jul15668800169
Aug23930098
Sep1111200114
Oct01960097
Nov00800080
Dec00736522601
Total505441282377452658