The Oxford Olympics Study 2016 found that sports-related costs for the Summer Games since 1960 were on average US$5.2 billion and for the Winter Games $3.1 billion. This does not include wider infrastructure costs like roads, urban rail, and airports, which often cost as much or more than the sports-related costs. The most expensive Summer Games were Beijing 2008 at US$40–44 billion and the most expensive Winter Games were Sochi 2014 at US$51 billion. As of 2016, costs per athlete were, on average, US$599,000 for the Summer Games and $1.3 million for the Winter Games. For London 2012, cost per athlete was $1.4 million; for Sochi 2014, $7.9 million.