Year Purchasing power parity; international dollars (Billions) 1998 28.694 1999 28.776 2000 28.183 2001 28.687 2002 26.888 2003 22.971 2004 22.109 2005 21.112 2006 20.989 2007 20.825 2008 17.761 2009 19.193 2010 23.249 2011 27.098 2012 31.163 2013 34.191 2014 35.502 2015 37.028 2016 37.965 2017 34.403 2018 36.947 2019 35.197 2020 32.887 2021 37.293 2022 42.507 2023 46.397 2024 49.035 2025 51.506 2026 54.125 2027 56.836 2028 59.660 2029 62.626