Year	current international $
1990	19890
1991	19290
1992	18920
1993	18840
1994	19450
1995	22450
1996	24580
1997	21500
1998	22280
1999	24140
2000	25320
2001	26020
2002	26870
2003	26790
2004	27430
2005	28770
2006	29890
2007	30700
2008	30570
2009	28830
2010	28980
2011	29380
2012	29770
2013	28760
2014	29550
2015	29780
2016	29800
2017	31510
2018	31630
2019	32890
2020	24100
2021	27240
2022	31920
2023	33790