I'd like to determine the total $ value of vouchers sent
electronically by companies as promotional offers each year in the US,
and specifically:
1. Total $ value of vouchers offered
2. % actually claimed (used) by consumers

Another set of numbers I need is for rebates:
1. Total $ value of rebates extended
2. % claimed

And finally, I also would like the $ value of electronic gift cards:
1. Purchased
2. % actually used

Thanks!