Year % 1995 2 2000 2.5 2003 2.7 2004 2.6 2005 2.6 2006 2.5 2007 2.6 2008 2.6 2009 2.6 2010 2.4 2011 2 2012 1.9 2013 2 2014 2 2015 1.9 2016 2.2 2017 2.4 2018 2.7 2019 2.5 2020 2.4 2021 2.6