On the basis of gdp which country is the largest economy of the world?

See Below top seven from 2013:

United States [+] 16,803,000 M.$ 1.9% 2013
Euro zone [+] 12,715,823 M.$ -0.4% 2013
United Kingdom [+] 2,535,761 M.$ 1.7% 2013
Germany [+] 3,635,807 M.$ 0.4% 2013
France [+] 2,734,919 M.$ 0.2% 2013
Japan [+] 4,900,713 M.$ 1.6% 2013
Spain [+] 1,358,687 M.$