To get there, Artprice limited its scope to fine-art sales at public auctions, filtering out results from what they refer to as the "opaque" gallery market. On that basis, they found that in 2010 "China accounted for 33% of global Fine Art sales (paintings, installations, sculptures, drawings, photography, prints), versus 30% in the USA, 19 % in the UK and 5% in France." The gallery and private-dealer scene is still seriously underdeveloped in China, so it's no surprise that excluding it boosted China's percentage while depressing the West's market share.