Yes, rather than reading such pointless (based on exchange rates?) "spending" figures (not to mention in different currencies: baht for Thailand, and dollars for Vietnam!), I'd be interested to learn what was the percentage of Americans, Brits, French, etc., among travellers to Vietnam and Thailand, and also the growth rates of such traveller segments. Also, which country attracted more couples and families? (I would imagine that this could influence per-person daily spending, as little kids, obviously, don't spend as much.*)
*Beware: sarcasm!