Year % 1987 4 1991 4 1995 3.2 2000 5.7 2003 6.2 2004 6 2005 5.9 2006 6.5 2007 6.8 2008 6.7 2009 7.1 2010 7.2 2011 6.7 2012 6.4 2013 6.7 2014 6.7 2015 6.5 2016 6.5 2017 6.9 2018 6.8 2019 7.2 2020 6.6 2021 6.7