Year	current US$
1987	1658.7587389999476
1988	1753.1928563219808
1989	1789.6445552811288
1990	1648.4852297454236
1991	1254.3124421297975
1992	1102.1037847324649
1993	1158.056327997125
1994	1323.032377669268
1995	1650.0492236520076
1996	1633.0106435411724
1997	1577.3365602397432
1998	1852.5549693339042
1999	1599.9062280833884
2000	1659.929049105278
2001	1825.192993731835
2002	2119.8550968455434
2003	2679.4062601615437
2004	3494.9905644895534
2005	4618.003508029132
2006	5757.531273011785
2007	8360.337759165957
2008	10435.21798035415
2009	8548.048590129929
2010	8397.809173114572
2011	9560.159425309419
2012	8930.729911649736
2013	9497.206475612105
2014	10031.342152669788
2015	8976.9544892648
2016	9404.38125929526
2017	10727.970863318411
2018	12494.423578964945
2019	12957.999114221826
2020	13047.456656399327
2021	14946.624968677972
2022	15692.30717001428
2023	18419.418712064416