Year % 1990 5.8 1995 2.4 1997 2.5 1999 2.8 2001 3.1 2002 2.9 2003 3.4 2004 4 2005 3.9 2006 3.6 2007 3.6 2008 4.1 2009 4 2010 3.8 2011 3.5 2012 4.2 2013 4.4 2014 4 2015 4.3 2016 4.5 2017 4.7 2018 4.8 2019 4.8 2020 5.3 2021 5.5 2022 5