Year	2017 PPP (% of population)
1980	1.7
1985	1.2
1990	0.7
1993	2
1994	2
1995	2
1996	1.7
1997	1.5
1998	1.2
1999	1
2000	1.1
2003	1.2
2004	1.3
2005	1.1
2006	1.1
2007	0.7
2008	0.9
2009	1.1
2010	1.1
2011	1.6
2012	1.5
2013	1.7
2014	1.5
2015	1.5
2016	1.7
2017	1.1
2018	1.2
2019	1.1
2020	1.4
2021	0.9