Worldwide, about 200 million tonnes of sulfuric acid are produced per year. Sixty percent comes from burning elemental sulfur. The remainder comes from the SO2 in smelter, roaster, and spent acid regeneration furnace offgases. Sulfuric acid is produced around the world. China is the largest producer. By far, the largest use of sulfuric acid is for making phosphate fertilizers, e.g., ammonium phosphate. Other large uses are for making other fertilizers and chemicals of all sorts. Sulfur acid price averaged about $50 per tonne from 2003 to 2007, spiked to over $400 in 2008, and settled at $150 per tonne in 2012.