Year Percent change (Units) 2000 -6.179 2001 26.175 2002 12.827 2003 -3.207 2004 16.950 2005 6.293 2006 6.303 2007 3.096 2008 8.621 2009 19.079 2010 19.462 2011 1.278 2012 28.055 2013 23.130 2014 -3.982 2015 -11.394 2016 -5.149 2017 3.992 2018 5.367 2019 -11.737 2020 9.208 2021 -1.463 2022 5.663 2023 -3.001 2024 18.642 2025 7.369 2026 9.659 2027 9.558 2028 -6.913 2029 4.098