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