Hong Kong (part of China, but generally different laws that are based on English law) ranks at 14, same as Oz. But having such a good rank doesn't stop corruption, there's still plenty e.g. an employee having to pay to get a job or tender rigging. I've seen evidence of both. I've done business in some of the countries that rank worse than Thailand, and I totally have seen why they are worse than Thailand, from immigration scamming a more expensive visa fee than needed through to a senior Government official not doing something that would benefit their country's GDP as they'd make no money from it. Crazy.