That's very interesting if you look at the pie charts, nothing looks very different. I'm interested at what Lan said....tourism is up around the world.
Maybe money doesn't have much to do with anything, and Belize doesn't need to tweak anything, or chase any particular dollar in Europe, or wherever.
Tourism is a luxury, and dependent on "What's in", or fashionable, or currently interesting.
The more important thing might be to look at, among tourists, who is going where? Maybe the Caribbean, snorkeling/scuba, rainforest ecotourism, etc; isn't the "in"thing. Maybe tourists are going to Croatia, or the East Coast of Italy, or Indonesia, or whatever...these days? Maybe Belize is wasting money on their junkets, suppositions, and complaints about expensive airfares.