Year	current international $
1990	18400
1991	19260
1992	19810
1993	20140
1994	20970
1995	22110
1996	22830
1997	23760
1998	24880
1999	25550
2000	26970
2001	27960
2002	28610
2003	29060
2004	29510
2005	30180
2006	32580
2007	34180
2008	35200
2009	34580
2010	35080
2011	36510
2012	36440
2013	36250
2014	36200
2015	36640
2016	40040
2017	41810
2018	43510
2019	46840
2020	44770
2021	50540
2022	56410
2023	58650