*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00112830
Feb00140822
Mar01216500177
Apr413648400624
May173814850004681
Jun522436520350026452
Jul303342646004018
Aug101633400360
Sep0428200286
Oct0013600136
Nov00150015
Dec0090171180
Total113316894971120736981