Here are the pre-tournament market-based predictions for the 2015.
This data is driven by a mix of Betfair (prediction market) and bookie data. Step 1: construct prices from the back, lay, and last transaction odds, in the Betfair order book or, when not available, the lowest odds to buy from a major bookie. For Betfair data we take the average of the cheapest cost to buy a marginal share and the highest price to sell a marginal share, unless the differential is too large or does not exist. Step 2: correct for historical bias and increased uncertainty in constructed prices near $0 or $1. We raise all of the constructed prices to a pre-set value depending on the domain. Step 3: normalized to equal 100% for any mutually exclusive set of outcomes.