Year	$ 2017 PPP (%)
1997	26.73
1998	25.58
1999	30.53
2000	33.81
2001	35.35
2002	18.72
2003	17.21
2004	15.76
2005	18.5
2006	21.84
2007	24.96
2008	23.22
2009	25.2
2010	27.21
2011	26.53
2012	25.08
2013	22.55
2015	16.46
2016	16.74
2017	16.01
2018	15.25
2019	14.09
2020	14.61
2021	12.73