Year 2017 PPP (%) 2004 2.5 2005 2.2 2006 1.4 2007 0.7 2008 1.1 2009 1.7 2010 1.6 2011 1.1 2012 1 2013 1.1 2014 0.8 2015 0.7 2016 0.6 2017 0.7 2018 0.4 2019 0.3 2020 0.4 2021 0.4