Year Percent change (Units) 2001 -2.374 2002 0.346 2003 0.691 2004 0.824 2005 5.214 2006 3.904 2007 2.621 2008 16.764 2009 -2.468 2010 1.274 2011 6.076 2012 1.665 2013 3.703 2014 3.839 2015 0.299 2016 0.356 2017 0.700 2018 2.880 2019 -0.290 2020 0.581 2021 4.620 2022 13.707 2023 8.738 2024 2.316 2025 -0.241 2026 2.215 2027 2.278 2028 2.306 2029 2.285