Year	2017 PPP (%)
1984	64.8
1985	62.6
1986	58.2
1987	57.9
1988	56.9
1989	57.8
1990	57.5
1991	57.3
1992	56.7
1993	56.2
1994	55
1995	54
1996	52.9
1997	52.6
1998	52.5
1999	51.9
2000	50.8
2001	50
2002	48.6
2003	47.2
2004	45.4
2005	43.8
2006	42.5
2007	41
2008	40
2009	38.8
2010	36.9
2011	34.9
2012	33.7
2013	31.8
2014	30.8
2015	29.9
2016	29.3
2017	28.2
2018	26.7
2019	25.8
2020	26.6
2021	26
2022	25.2