Year	2017 PPP (%)
1984	84.3
1985	79.7
1986	70.5
1987	69
1988	66.9
1989	69.3
1990	68.6
1991	67.7
1992	66.4
1993	65
1994	62.5
1995	60.3
1996	58.1
1997	57.5
1998	57.6
1999	55.9
2000	54.1
2001	52
2002	49
2003	46.2
2004	43.6
2005	40.5
2006	39.1
2007	36.5
2008	35
2009	32.6
2010	29.7
2011	26.8
2012	24.5
2013	20
2014	17.9
2015	15.8
2016	14.2
2017	13.1
2018	11.6
2019	10.2
2020	10.1
2021	9.1
2022	8.9