Year	current international $
1990	13590
1991	14370
1992	14740
1993	14710
1994	15250
1995	15830
1996	16390
1997	17320
1998	18120
1999	18260
2000	19650
2001	21120
2002	22610
2003	23830
2004	25160
2005	25620
2006	28020
2007	28570
2008	29940
2009	29680
2010	27290
2011	24960
2012	25120
2013	25990
2014	26800
2015	26740
2016	27380
2017	28460
2018	29290
2019	31330
2020	28970
2021	32760
2022	38520
2023	40880