Year Percent change 1991 0 1992 1.772 1993 5.874 1994 -3.061 1995 9.82 1996 5.819 1997 -4.045 1998 2.778 1999 7.713 2000 -0.43 2001 2.009 2002 0.665 2003 5.979 2004 5.747 2005 8.969 2006 18.869 2007 2.818 2008 1.08 2009 -1.042 2010 4.774 2011 4.704 2012 5.795 2013 6.09 2014 5.58 2015 0.437 2016 1.841 2017 3.014 2018 3.006 2019 6.354 2020 4.705 2021 5.122 2022 10.409 2023 6.737 2024 8.09