Year	2017 PPP (%)
1981	19.7
1982	19
1983	18
1984	17.3
1985	16.5
1986	15.9
1987	15.5
1988	14.8
1989	14.6
1990	14.4
1991	13.6
1992	12.7
1993	12.3
1994	11.7
1995	11.5
1996	10.9
2002	10
2003	9.5
2004	9
2005	8.4
2006	7.8
2007	7.3
2008	7
2009	6.6
2010	5.4
2011	4.4
2012	4
2013	3.7
2014	3.5
2015	3.3
2016	3.1
2017	2.4
2018	1.9
2019	2.1
2020	2.8
2021	2.4
2022	1.9