Year	2017 PPP (%)
1984	53
1987	52.3
1990	44.3
1993	43.9
1996	37.3
1998	48.4
1999	34.6
2000	33.6
2001	31.4
2002	23.5
2003	23.1
2004	23.7
2005	21.9
2006	25.5
2007	21.8
2008	21.1
2009	19.2
2010	16.7
2011	15.2
2012	14.1
2013	12.7
2014	11.4
2015	10.1
2016	9.3
2017	7.9
2018	6.7
2019	6
2020	5.6
2021	5.3
2022	4.5
2023	3.8