Year	2017 PPP (%)
1981	19.1
1982	18.3
1983	17.3
1984	15.8
1985	14.9
1986	14.1
1987	13.6
1988	12.6
1989	14.1
1990	13.9
1991	13.6
1992	13.1
1993	12.7
1994	11.8
1995	11.1
1996	10.4
1997	10.4
1998	10.6
1999	10.1
2000	9.7
2001	9.3
2002	8.7
2003	8
2004	7.2
2005	6.5
2006	6.2
2007	5.7
2008	5.4
2009	5.1
2010	4.5
2011	3.9
2012	3.6
2013	3.2
2014	3.1
2015	3.1
2016	3
2017	2.9
2018	2.7
2019	2.8
2020	3.1
2021	3
2022	2.8