Year Percent change 1996 1.96 1997 10.73 1998 12.015 1999 2.82 2000 16.508 2001 14.927 2002 8.214 2003 12.716 2004 40.7 2005 22.963 2006 14.365 2007 11.62 2008 4.178 2009 -10.55 2010 15.927 2011 10.15 2012 4.182 2013 0.608 2014 9.23 2015 5.2 2016 4.398 2017 6.664 2018 4.188 2019 3.72 2020 4 2021 4 2022 4 2023 3.993 2024 3.993