Based on a fertilizer plant in Shiraz, the world's largest ethylene unit, in Asalouyeh, and the completion of other special economic zone projects, Iran's exports in petrochemicals reached $5.5 billion in 2007, $9 billion in 2008 and $7.6 billion during the first ten months of the Iranian calendar year 2010. National Petrochemical Company's output capacity will increase to over 100 million tpa by 2015 from an estimated 50 million tpa in 2010 thus becoming the world' second largest chemical producer globally after Dow Chemical with Iran housing some of the world's largest chemical complexes.