Year current US$ 2002 1651000000 2003 1738000000 2004 1872000000 2005 2096000000 2006 2280000000 2007 2280000000 2008 2311000000 2009 2368000000 2010 2428000000 2011 2524000000 2012 2528000000 2013 2515000000 2014 2493000000 2015 2564000000 2016 2582000000 2017 2578000000 2018 2657000000 2019 2852000000 2020 2743000000 2021 2923000000