Year	2017 PPP (% of population)
1999	44.8
2001	47.2
2002	43.7
2003	39.7
2004	28.9
2005	19.4
2006	15.5
2007	13.7
2008	9.2
2009	13.8
2010	14
2011	13.1
2012	11.2
2013	11.3
2014	11.4
2015	9.4
2016	9.5
2017	8.1
2018	9.4
2019	9.8
2020	6.7
2021	8.7
2022	10