Year	current US$
1992	1240
1993	1190
1994	1270
1995	1490
1996	1640
1997	1590
1998	1580
1999	1610
2000	1710
2001	1760
2002	1950
2003	2250
2004	2960
2005	3880
2006	4900
2007	6510
2008	8800
2009	9220
2010	8710
2011	9010
2012	9200
2013	9390
2014	9760
2015	9610
2016	9460
2017	10030
2018	11520
2019	12670
2020	12710
2021	14190
2022	15490
2023	16670