Year	2017 PPP (%)
1979	16.8
1989	30.1
1991	27.7
1995	22.1
1997	20.7
1998	21
1999	19
2000	17.6
2001	21
2002	17.7
2003	17.1
2004	16.2
2005	15.7
2006	16.1
2007	13.6
2008	9.8
2009	8.5
2010	9
2011	7.3
2012	8
2013	7
2014	7
2015	5.9
2016	5.8
2017	5.5
2018	4.7
2019	4.3
2021	4.7
2023	4.8