Year	2017 PPP (% of population)
1990	90.2
1991	90.4
1992	90.8
1993	91.5
1994	91.6
1995	91.4
1996	91.2
1997	91.1
1998	91.3
1999	91.5
2000	91.6
2001	91.6
2002	91.6
2003	91.7
2004	91.3
2005	91
2006	90.3
2007	90
2008	89.5
2009	89.4
2010	88.9
2011	88.7
2012	88.4
2013	88.1
2014	87.7
2015	87.5
2016	87.5
2017	87.4
2018	87.3
2019	87.3