*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0006510516
Feb012130276490
Mar1476500770
Apr4570800717
May24765500686
Jun392038800447
Jul51427500330
Aug31325700291
Sep85136200448
Oct1029100292
Nov4035500359
Dec00930301394
Total240454362610875740