Year Percent change 1996 19.044 1997 18.838 1998 4.659 1999 -16.372 2000 9.557 2001 21.209 2002 18.611 2003 8.426 2004 4.093 2005 17.028 2006 12.645 2007 3.174 2008 13.508 2009 -12.788 2010 18.942 2011 15.404 2012 12.389 2013 9.86 2014 3.269 2015 0.875 2016 4.008 2017 13.591 2018 4.913 2019 3.246 2020 4.491 2021 4.438 2022 4.125 2023 3.886 2024 3.731