Year Percent change 1999 -12.147 2000 7.759 2001 4.993 2002 7.116 2003 4.415 2004 9.047 2005 10.154 2006 5.108 2007 6.44 2008 5.656 2009 -2.732 2010 0.731 2011 2.036 2012 -0.682 2013 2.893 2014 -1.59 2015 1.776 2016 3.34 2017 2.049 2018 4.354 2019 3.499 2020 4 2021 4 2022 4 2023 4 2024 4