Year Percent change (Units) 2005 8.662 2006 19.302 2007 5.601 2008 1.035 2009 22.422 2010 -1.968 2011 -3.370 2012 0.262 2013 -1.105 2014 0.275 2015 9.784 2016 8.150 2017 5.082 2018 -14.426 2019 4.212 2020 1.886 2021 1.077 2022 3.552 2023 6.203 2024 4.709 2025 2.993 2026 2.664 2027 2.530 2028 2.196 2029 2.057