Year Percent change (Units) 2001 -0.726 2002 -0.273 2003 0.647 2004 0.537 2005 3.558 2006 4.239 2007 3.020 2008 9.931 2009 4.683 2010 1.094 2011 2.633 2012 5.439 2013 2.845 2014 3.962 2015 2.199 2016 -1.336 2017 1.101 2018 2.441 2019 0.438 2020 0.702 2021 -0.481 2022 13.188 2023 12.335 2024 3.101 2025 2.210 2026 2.219 2027 2.335 2028 2.278 2029 2.293