The output of the global construction industry was worth an estimated $10.8 trillion in 2017, and in 2018 was forecast to rise to $12.9 trillion by 2022. As a sector, construction accounts for more than 10% of global GDP (in developed countries, construction comprises 6-9% of GDP), and employs around 7% of the total employed workforce around the globe (accounting for over 273 million full- and part-time jobs in 2014). Since 2010, China has been the world's largest single construction market. The United States is the second largest construction market with a 2018 output of $1.581 trillion.