Year	constant 2015 US$
1993	2857.2169521202313
1994	2816.488377047061
1995	2737.6295588304656
1996	2936.976427550776
1997	2987.8492668564745
1998	2964.6756090682647
1999	3165.4883942791303
2000	3168.7328232103196
2001	3525.2379666931533
2002	4133.176196417661
2003	4343.472977173796
2004	4431.384905346354
2005	4808.4762283214795
2006	4984.071342438441
2007	5648.02116022188
2008	5374.570647567173
2009	5466.098507095328
2010	5927.002480411715
2011	6000.57251512864
2012	5264.572931554823
2013	5041.432400930644
2014	4870.349574208848
2015	3972.055859649371
2016	4679.579451619244
2017	4589.924399927299
2018	4012.259798520914
2019	3702.670526585857
2020	3881.9900725570715
2021	4142.011441653347