*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0009257835875
Feb1919362218223790
Mar10283786003824
Apr19353741003795
May593915804006254
Jun10524206294008819
Jul414553157003653
Aug291994002005
Sep0102574002584
Oct012738002739
Nov002100002100
Dec011079632774363
Total2373359352031201088249801