What was our return on the last expo?

Stuff reports:

The Government will spend $53 million building a pavilion to promote Kiwi business at the World Expo 2020 in Dubai.

The building of a pavilion in the Expo’s sustainability precinct was announced on Sunday by the Economic Development Minister Simon Bridges and the Trade Minister Todd McClay.

Showcasing New Zealand to the world at the United Arab Emirates’ Expo is crucial to boosting economic growth, Bridges said. …

The seven-month expo begins in October 2020 and is predicted to attract 25 million “high value” visitors from across Europe, the Middle East, North Africa and Asia.

Spending that much money to be at the World Expo may be a good investment. It is quite possible.

But I’d like to know if we have anything more solid to go on that projections. What was the measureable return on investment for Expo 2008 in Spain, Expo 2010 in Shanghai, Expo 2012 in Yeosu and Expo 2015 in Milan?

It seems we are not taking part in Expo 2017 in Kazakhstan? Presumably as not seen as a good investment. So hopefully there is some rigour behind the decision to take part.