Year	current international $
1990	9440
1991	9390
1992	9070
1993	9290
1994	9630
1995	9960
1996	10490
1997	11210
1998	11750
1999	11870
2000	12630
2001	12510
2002	12720
2003	13160
2004	13760
2005	14520
2006	15570
2007	16620
2008	16780
2009	16110
2010	16190
2011	15690
2012	15180
2013	15150
2014	14980
2015	15290
2016	15690
2017	15550
2018	16170
2019	16590
2020	14480
2021	14470
2022	17380
2023	18550