Year	current international $
1990	6300
1991	6350
1992	6250
1993	6370
1994	6620
1995	6850
1996	7140
1997	7350
1998	7370
1999	7560
2000	7980
2001	8250
2002	8670
2003	9000
2004	9640
2005	10360
2006	11170
2007	11820
2008	12300
2009	12150
2010	12520
2011	12970
2012	12810
2013	13240
2014	13230
2015	13290
2016	13370
2017	13590
2018	13260
2019	13360
2020	12850
2021	13900
2022	15010
2023	15630