Year	$ 2017 PPP (%)
1997	24.93
1998	23.67
1999	28.41
2000	31.01
2001	32.22
2002	15.5
2003	14.8
2004	13.03
2005	15.29
2006	17.49
2007	20.78
2008	18.55
2009	19.52
2010	22.23
2011	21.74
2012	20.34
2013	18.06
2015	11.82
2016	12.23
2017	11.58
2018	11.19
2019	9.91
2020	10.12
2021	8.46