Year	current US$
1998	447.75176437950205
1999	427.79665363650497
2000	382.1721725339798
2001	456.27250166493985
2002	572.6336181918967
2003	673.1908687034636
2004	761.0827362003503
2005	947.1403906527012
2006	1378.4481650452883
2007	2062.9689315350474
2008	3092.188039325102
2009	3275.46160334341
2010	4040.2053095331717
2011	4784.739454342085
2012	5294.537687744208
2013	5674.20814037456
2014	6051.6970620124275
2015	4460.301609763837
2016	3029.305998617436
2017	3226.1524483414455
2018	3414.8229671103286
2019	3656.1416822944548
2020	3530.6605367863717
2021	3965.424395761959