Year Percent change 1996 3.2 1997 2.996 1998 1.875 1999 2.277 2000 4.049 2001 2.89 2002 3.3 2003 3.656 2004 2.529 2005 3.396 2006 3.61 2007 5.4 2008 8.957 2009 -2.134 2010 2.075 2011 4.375 2012 0.6 2013 -2.372 2014 0.408 2015 0.481 2016 -0.888 2017 -0.49 2018 3.485 2019 1.377 2020 1.902 2021 2.073 2022 2.132 2023 2.156 2024 2.162