*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0003451454
Feb101450123269
Mar1041700418
Apr161937001944
May201242650002794
Jun1511651668001984
Jul1061782200945
Aug28678800822
Sep0285600858
Oct111028001030
Nov0067300673
Dec001530566719
Total309321111373114012910