*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0003301304
Feb13910137232
Mar12415800183
Apr1219700119
May4510900118
Jun71114300161
Jul55620072
Aug25690076
Sep1111600118
Oct1119500197
Nov1018900190
Dec00970359456
Total2476132637972226