Year Percent change 1991 6.565 1992 4.759 1993 4.745 1994 5.59 1995 5.648 1996 3.19 1997 3.754 1998 2.755 1999 2.83 2000 1.689 2001 2.881 2002 1.6 2003 4.462 2004 1.256 2005 3.474 2006 3.357 2007 5.104 2008 4.084 2009 4.136 2010 5.059 2011 3.89 2012 5.917 2013 5.69 2014 4.775 2015 3.879 2016 4.217 2017 6.154 2018 7.493 2019 6.751 2020 5.215 2021 4.402 2022 4.287 2023 4.082 2024 3.954