*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00018175193
Feb0048160109
Mar00860086
Apr0188900107
May21475127001604
Jun174154192004363
Jul91437149001595
Aug76720085
Sep1510200108
Oct00830083
Nov00770077
Dec00694679752
Total3670951094239149162