Year	current international $
1990	620
1991	620
1992	840
1993	910
1994	900
1995	970
1996	1550
1997	4030
1998	4450
1999	5740
2000	5210
2001	5640
2002	7180
2003	6820
2004	8550
2005	12320
2006	20240
2007	23230
2008	24660
2009	21390
2010	16690
2011	19120
2012	21560
2013	20650
2014	19970
2015	15860
2016	13910
2017	14620
2018	15170
2019	12970
2020	11080
2021	13550
2022	12690
2023	13420