*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00010646656
Feb211931247444
Mar31154000554
Apr6856200576
May79051063001975
Jun1544132598007026
Jul1325192163004695
Aug51377100789
Sep3440100408
Oct4030900313
Nov0027900279
Dec001140616730
Total587874899311150918445