Year	current US$
1995	388.8494301228037
1996	424.1298272408544
1997	450.88111706824685
1998	514.3862797395874
1999	503.41399386026336
2000	524.8025836921398
2001	589.4749067320762
2002	664.1224506172712
2003	800.1084183783967
2004	1045.0872894331262
2005	1450.4589017030032
2006	1934.082726371657
2007	2836.2842365656425
2008	3669.316749135573
2009	2672.2591321754808
2010	2850.685031512436
2011	3100.323748318805
2012	3291.4082264459935
2013	3551.6409053280418
2014	3675.9769642066763
2015	3288.584087190859
2016	3245.3815561362776
2017	3630.541159164465
2018	3859.456562946276
2019	4222.088278196782
2020	3818.0102992635107
2021	4023.251428947314