Year	2017 PPP (%)
1984	52.9
1985	50.6
1986	48.9
1987	46.7
1988	43.4
1989	48.1
1990	47.1
1991	46
1992	44.2
1993	42.4
1994	39.2
1995	36.4
1996	33.9
1997	33.6
1998	34.1
1999	32.1
2000	30.4
2001	28.5
2002	25.9
2003	23.2
2004	20.8
2005	18.1
2006	17.4
2007	15.7
2008	14.8
2009	13.3
2010	11.6
2011	9.6
2012	8.4
2013	5.5
2014	4.6
2015	3.7
2016	3.1
2017	2.7
2018	2.2
2019	1.8
2020	1.7
2021	1.6
2022	1.5