Year	current international $
1990	6430
1991	6930
1992	7640
1993	8000
1994	8700
1995	8720
1996	9340
1997	10310
1998	10830
1999	10830
2000	10810
2001	10600
2002	10000
2003	9800
2004	10530
2005	11830
2006	12760
2007	13940
2008	15080
2009	15740
2010	17060
2011	18320
2012	17920
2013	19420
2014	20320
2015	21010
2016	21560
2017	22090
2018	22800
2019	24310
2020	24170
2021	26280
2022	29720
2023	31690