Year	current international $
1990	6870
1991	7740
1992	8540
1993	9390
1994	9990
1995	9750
1996	10320
1997	11200
1998	11590
1999	11210
2000	11240
2001	10840
2002	9480
2003	10530
2004	10810
2005	11980
2006	14410
2007	16080
2008	16910
2009	15750
2010	17450
2011	18770
2012	19170
2013	19680
2014	19250
2015	19680
2016	19800
2017	22910
2018	23620
2019	22610
2020	21700
2021	25560
2022	28490
2023	28710