*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00013694707
Feb012644315584
Mar2221253001277
Apr3401833001876
May155890145006050
Jun71190702330019374
Jul46828422800010610
Aug261790100944
Sep141008001013
Oct0188800889
Nov0036600366
Dec011571740899
Total16433330932818174944589