Year	current international $
1990	5230
1991	5340
1992	4920
1993	4650
1994	4190
1995	3850
1996	4050
1997	4600
1998	5060
1999	5340
2000	5780
2001	6220
2002	6690
2003	7380
2004	8490
2005	9670
2006	10970
2007	12220
2008	13720
2009	13740
2010	15050
2011	16380
2012	17710
2013	18350
2014	18470
2015	17360
2016	16990
2017	17720
2018	19300
2019	21640
2020	23860
2021	26600
2022	27280
2023	29640