Year	current international $
1990	8470
1991	9000
1992	9390
1993	8950
1994	9350
1995	8710
1996	9280
1997	10020
1998	10590
1999	10890
2000	11550
2001	11610
2002	11690
2003	12000
2004	12600
2005	13110
2006	14370
2007	14860
2008	15570
2009	15090
2010	15890
2011	17170
2012	17790
2013	17800
2014	18530
2015	18740
2016	19700
2017	20060
2018	20470
2019	20500
2020	18850
2021	20590
2022	23310
2023	24970