Year	current US$
2000	274.13034393313194
2001	281.00929671653427
2002	298.56610881005236
2003	338.3763935485353
2004	375.7307266844922
2005	398.262213861195
2006	422.4202913601714
2007	465.0766557731337
2008	512.786791043714
2009	523.983377755695
2010	545.9011907242556
2011	597.0183075427067
2012	598.6615078243942
2013	606.3930845595817
2014	625.3448636030395
2015	596.0943572301119
2016	608.447697836469
2017	629.0636719806292
2018	656.4727544707215
2019	667.1481575113758
2020	750.2836063941982
2021	796.6069417350277