Year	current US$
2000	16.73021868
2001	31.96472031
2002	41.28929109
2003	57.47072042
2004	74.90794682
2005	91.70543124
2006	122.00308209
2007	189.95836389
2008	236.14882801
2009	202.29171848
2010	198.515332
2011	225.30715396
2012	198.3758392
2013	237.62564791
2014	243.20704934
2015	199.38795847
2016	196.77857682
2017	209.63641384
2018	236.41166087
2019	237.59102593
2020	241.5555055
2021	328.70428268