Greater Houston has the seventh-highest metropolitan-area gross domestic product in the United States, valued at $490 billion in 2017. A major trade center anchored by the Port of Houston, Houston–The Woodlands–Sugar Land has the highest trade export value of all metropolitan areas, at over $120 billion in 2018, accounting for 42% of the total exports of Texas. As of 2020, Greater Houston is home to the headquarters of 22 Fortune 500 companies, ranking fourth among all metropolitan statistical areas. The Greater Houston metropolitan area was ranked the fourth-most diverse metropolitan area in the United States in 2012.