New Gallup poll on perceptions of drugs in Latin America

An interesting survey on perceptions of illicit drug trafficking in Latin America, in which Uruguay ranks third. Is it a matter of more drug sales going on there, or is it a matter of education and awareness? I live in a nice suburb in Minnesota. I've never seen drugs here, but because I'm not naive, would probably tell a survey that it goes on, sure, etc. What's behind the numbers?