The northwestern U.S. state of Washington's economy grew 3.7% in 2016, nearly two and a half times the national rate. Average income per head in 2009 was $41,751, 12th among states of the U.S. The United States' largest concentration of STEM (science, technology, engineering and math) workers reside in Washington state. The state has a large volume of seaborne foreign trade with Asia. Leading economic sectors are government, real estate and rental leasing, and information; manufacturing comes fourth (8.6% of the state's GDP). Fruit and vegetable production, and hydroelectric power, are other important sectors. Important firms based in Washington include Boeing, Starbucks, Amazon, Costco, and Microsoft.