*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0004308312
Feb0196081178
Mar11949500515
Apr03637000406
May48344600884
Jun15336977003461
Jul15793441001249
Aug5418400193
Sep1223400237
Oct0031300313
Nov0011800118
Dec00760596672
Total415058245049858538