Year	current US$
1989	3190.0575118749307
1990	3428.1912697782454
1991	3580.8899465347095
1992	3964.3030875491945
1993	4035.127151542216
1994	4112.415571822225
1995	4396.431816551333
1996	4698.266772717755
1997	4817.770724013388
1998	4821.606394378997
1999	4739.313387289095
2000	5050.382979939588
2001	5121.7591360660235
2002	5240.565466529883
2003	5888.897449256316
2004	7079.668236465198
2005	8399.995919862296
2006	9337.142762506246
2007	10476.314550366042
2008	11402.226783537819
2009	10943.257976529956
2010	10997.028536438502
2011	11475.757878867082
2012	12230.61219177315
2013	12737.764865976642
2014	12664.671178631981
2015	12285.859150094453
2016	11933.761608438384
2017	12121.784311595975
2018	13339.782806638332
2019	14181.403393269109
2020	13084.026260052942
2021	14080.151003498122
2022	15190.727040468017
2023	15754.60737544122