Year	current US$
2003	26.71866798
2004	51.29241562
2005	52.51676941
2006	56.19692612
2007	99.6492157
2008	138.10931396
2009	139.05555725
2010	143.52603149
2011	160.81466675
2012	173.40316772
2013	185.73556519
2014	178.0239563
2015	148.30059814
2016	198.70619202
2017	195.82373047
2018	231.00331116
2019	239.57891846
2020	245.48046875
2021	248.92311096