Year	current international $
1990	7790
1991	7330
1992	6580
1993	5650
1994	4540
1995	4090
1996	3780
1997	3760
1998	3730
1999	3790
2000	3990
2001	4550
2002	4920
2003	5550
2004	6440
2005	6880
2006	7630
2007	8600
2008	8950
2009	7640
2010	8240
2011	8790
2012	9580
2013	10900
2014	10540
2015	10490
2016	11130
2017	11860
2018	12830
2019	14560
2020	16060
2021	17520
2022	16920
2023	18560