Year 2017 PPP (%) 2004 8 2005 5.2 2006 3.1 2007 2.2 2008 2.4 2009 4.3 2010 3.7 2011 2.1 2012 2.4 2013 2.1 2014 2.5 2015 1.8 2016 2.2 2017 1.9 2018 1.4 2019 0.8 2020 0.6 2021 0.5