*Excludes Observations that span multiple months

  B
b
t
W
w
 
Jan0005619331989
Feb01168156481345
Mar0951243001338
Apr102301158001398
May192181204002404
Jun252011233002269
Jul19811023001123
Aug5471400723
Sep1266200665
Oct0168100682
Nov0062600626
Dec00359514841848
Total794616758466406516410