Year Percent change 2001 0.623 2002 2.925 2003 2.516 2004 0.468 2005 3.823 2006 1.85 2007 3.961 2008 3.321 2009 -2.443 2010 3.543 2011 1.374 2012 2.675 2013 4.58 2014 8.609 2015 10.553 2016 5.691 2017 6.65 2018 6.392 2019 5.189 2020 4.444 2021 3.756 2022 3.466 2023 3.259 2024 3.156