*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan17022000192
Feb4710860134
Mar0011171119
Apr0011318140
May00823180319
Jun00293008681197
Jul001418081275
Aug0151493158
Sep00389395
Oct00065065
Nov00070070
Dec77830680849
Total9952761148610443613