*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan00026769
Feb001701734
Mar015700085
Apr04314800191
May26453600683
Jun13219073002276
Jul61101656001763
Aug61114600163
Sep00970097
Oct00920092
Nov00680068
Dec00370210247
Total274005144022945768