Year Percent change (Units) 2005 -8.433 2006 -9.045 2007 -4.509 2008 76.864 2009 -5.652 2010 -0.160 2011 14.395 2012 25.279 2013 3.648 2014 16.423 2015 2.698 2016 4.363 2017 -6.011 2018 -1.219 2019 8.487 2020 1.982 2021 7.207 2022 2.841 2023 0.596 2024 1.576 2025 1.322 2026 1.209 2027 0.938 2028 0.961 2029 0.827