tl;dr: "Coal [...] is the biggest source of post-tax subsidies, amounting to 3.0 percent of global GDP in 2011 and rising to 3.9 percent in 2015. [...] Petrole

tl;dr: "Coal [...] is the biggest source of post-tax subsidies, amounting to 3.0 percent of global GDP in 2011 and rising to 3.9 percent in 2015. [...] Petroleum is the next most heavily subsidized product, [...] remaining at 1.8 percent of global GDP in 2015 despite declining petroleum prices. This is followed by natural gas, [which] is only about one-third of that for petroleum. Last is electricity, for which the projected post-tax subsidy declines to just 0.2 percent of global GDP in 2015." Solar, wind, etc. are presumably subsets of the electricity subsidies, and are so negligible as to not warrant a single mention in this report.