Who buys the most international luxury new-build property?

An 'attractive' exchange rate is often cited as a key motivator by international buyers, but exactly how much impact do these currency movements have on the world's prime residential property markets?

Casting a beady eye over prime property prices across the world's 28 key cities, Knight Frank's Prime Global House Price Index is a feat in itself; mainly, how on earth do they get it onto just two pages?

There's always a bit of give in the measurement of a property's square footage, but where you draw the line can have a huge impact, especially for international buyers who may expect something rather different…