Year	current international $
1990	4080
1991	4010
1992	4260
1993	4400
1994	4840
1995	5880
1996	6330
1997	6810
1998	7290
1999	7720
2000	8110
2001	8000
2002	8590
2003	9700
2004	10440
2005	9420
2006	11730
2007	10880
2008	12020
2009	10910
2010	11240
2011	12220
2012	12630
2013	13530
2014	14980
2015	16160
2016	16850
2017	17680
2018	19230
2019	20130
2020	12020
2021	17110
2022	20820
2023	21720