Year	current international $
1990	2920
1991	3170
1992	3400
1993	3680
1994	4020
1995	4360
1996	4720
1997	4940
1998	4150
1999	4090
2000	4370
2001	4710
2002	4970
2003	5190
2004	5490
2005	5890
2006	6360
2007	6870
2008	7370
2009	7660
2010	8210
2011	8770
2012	9350
2013	9670
2014	9830
2015	9800
2016	10040
2017	10460
2018	11150
2019	11750
2020	11530
2021	12550
2022	14050
2023	15210