Year Percent change (Units) 1996 0.000 1998 -6.426 1999 41.265 2000 69.438 2001 5.474 2002 3.993 2003 16.672 2004 1.033 2005 3.422 2006 1.405 2007 8.990 2008 -8.346 2009 -45.313 2010 25.322 2011 24.328 2012 12.712 2013 2.426 2014 10.134 2015 -6.094 2016 -3.598 2017 -13.936 2018 12.687 2019 -12.221 2020 -10.248 2021 20.193 2022 -8.618 2023 0.082 2024 1.696 2025 1.342 2026 1.678 2027 1.609 2028 -3.024 2029 -0.917