Year Percent change 2001 -7.656 2002 13.231 2003 31.648 2004 5.726 2005 14.442 2006 4.919 2007 17.205 2008 4.218 2009 -8.816 2010 16.825 2011 3.646 2012 -0.836 2013 21.909 2014 1.668 2015 9.614 2016 12.662 2017 8.47 2018 6.625 2019 6.7 2020 8 2021 7.9 2022 8 2023 8.2 2024 8.3