Year	current US$
2000	1175.62193067
2001	1109.16523826
2002	1268.7619672
2003	1598.57644023
2004	1979.15959657
2005	2165.25705102
2006	2289.04416529
2007	2781.61676433
2008	2970.59912403
2009	2929.13377522
2010	3600.11515715
2011	4329.06051313
2012	4325.11949257
2013	3957.46448854
2014	4298.7281828
2015	3780.81375349
2016	3877.9329562
2017	4142.51358198
2018	4186.33634398
2019	4089.48887533
2020	4390.46770711
2021	5364.85954895