Year	2017 PPP (%)
1984	30.3
1985	29.4
1986	28.5
1987	28.1
1988	27
1989	28.4
1990	28.2
1991	27.9
1992	27.3
1993	26.9
1994	25.9
1995	24.9
1996	24.1
1997	23.9
1998	24
1999	23.5
2000	22.8
2001	22.2
2002	21.2
2003	20.2
2004	18.9
2005	17.7
2006	17
2007	16.1
2008	15.5
2009	14.8
2010	13.6
2011	12.4
2012	11.7
2013	10.7
2014	10.3
2015	10
2016	9.7
2017	9.2
2018	8.4
2019	8.3
2020	8.8
2021	8.6
2022	8.1