Year	current US$
1986	5328.494903401827
1987	5845.3436755621415
1988	6231.952283609031
1989	6967.605205337437
1990	6890.507766168626
1991	6940.539299076645
1992	6758.0950287734995
1993	7074.535891485546
1994	7343.971459124419
1995	7409.270762324334
1996	7860.962410409828
1997	8331.115157356548
1998	9415.73973338
1999	9765.189009406595
2000	10076.465278309586
2001	9986.699514210877
2002	10077.289373487418
2003	10311.723118273563
2004	11030.803777474574
2005	12095.236171265116
2006	13015.401661772432
2007	14667.276888995151
2008	14767.144494547289
2009	13934.250662124212
2010	14280.94345893932
2011	13909.897628942415
2012	14181.485197126325
2013	14355.375417063009
2014	14373.321384915296
2015	14354.400546250436
2016	14620.674420792358
2017	15074.276526635158
2018	15332.939752825434
2019	15936.727920194911
2020	14427.54890200258
2021	14810.01094919815