The GDP price index in the United States in 2016 was about 106 ​, and real GDP in 2016 was ​$17.7 trillion​ (2012 dollars). The GDP price index in the United States in 2018 was about 110 ​, and real GDP in 2018 was ​$18.6 trillion​ (2012 dollars). Calculate nominal GDP in 2016 and in 2018 and the percentage increase in nominal GDP between 2016 and 2018 .