Year Percent change 2001 -0.712 2002 0.089 2003 0.499 2004 0.952 2005 4.084 2006 4.082 2007 3.294 2008 11.899 2009 1.424 2010 1.448 2011 4.689 2012 3.586 2013 3.41 2014 4.146 2015 0.947 2016 -1.033 2017 0.914 2018 2.8 2019 2.35 2020 2 2021 2 2022 2 2023 2 2024 2