Year U.S. dollars (Billions) 1994 0.850 1995 1.961 1996 3.148 1997 3.608 1998 3.730 1999 2.898 2000 3.144 2001 3.311 2002 3.493 2003 4.103 2004 5.269 2005 6.590 2006 7.979 2007 10.458 2008 13.158 2009 11.069 2010 12.425 2011 15.475 2012 16.894 2013 17.516 2014 17.966 2015 15.223 2016 15.445 2017 16.472 2018 17.905 2019 17.645 2020 16.013 2021 18.849 2022 24.985 2023 30.536 2024 32.865 2025 35.554 2026 38.234 2027 41.051 2028 43.754 2029 47.549