Year	current US$
2000	2542.91761797
2001	2635.66077356
2002	2890.80429223
2003	3442.42175399
2004	3876.43762094
2005	3912.29452822
2006	3935.84744026
2007	4264.55245298
2008	4870.1148718
2009	4951.35453618
2010	5052.97860688
2011	5979.64757192
2012	5650.43011056
2013	6034.46363353
2014	6147.13254509
2015	6042.32458762
2016	6029.15584613
2017	6033.29285327
2018	6062.25315173
2019	6196.7938928
2020	6463.80137588
2021	6951.10264578