Year	current international $
1990	3620
1991	3780
1992	4060
1993	4110
1994	4270
1995	4430
1996	4740
1997	5040
1998	5300
1999	5640
2000	5940
2001	6250
2002	6370
2003	6750
2004	7280
2005	7620
2006	8240
2007	8890
2008	9330
2009	9640
2010	9960
2011	9840
2012	10040
2013	10080
2014	10430
2015	10360
2016	10610
2017	10870
2018	11390
2019	11990
2020	11350
2021	11840
2022	12960
2023	13310