You do realise those spend figures are provided by TAT and are pure politically motivated fiction? Just look at Lao spend for example 5502b per day/$870 per trip? from a country where average GDP per capita is just under $3000 per year?!?
Or if you compare chinese spend (6118b per day or $1536 per trip) to what it's regional competitors ( Vietnam, Malaysia, Indonesia/bali) say Chinese spend ($800 to $1000) Thai figures range from 50 to 100% higher for no real reason (and really we all know the tour group Chinese, which untill covid were the majority of chinese visitors, were spending no where close to that).
Even the western figures are wacky, like average spend of Swiss vs Spain being nearly the same? Highly unlikely