Year	current US$
2000	1.1637653887921575
2001	1.248798153059895
2002	1.7162705307190522
2003	1.5194067404974299
2004	4.0382939385719325
2005	1.9637096037006048
2006	1.8266305370900355
2007	1.7555326398912827
2008	2.333977298021355
2009	2.5750902933045126
2010	3.336679069460041
2011	4.819146552836446
2012	3.998382892264638
2013	3.0434050542116715
2014	4.275447480199021
2015	3.4529846362885275
2016	2.55172915671109
2017	2.400408361236283
2018	2.2678373164084125
2019	2.1294660228647366
2020	1.7260156953994348
2021	3.2360813379641686