Year Percent change (Units) 2003 -11.349 2004 65.794 2005 -4.949 2006 27.146 2007 7.201 2008 -9.070 2009 -28.101 2010 2.124 2011 21.488 2012 -15.079 2013 4.945 2014 -10.178 2015 -8.936 2016 6.694 2017 3.671 2018 11.916 2019 7.338 2020 -11.411 2021 17.327 2022 29.712 2023 -8.945 2024 -0.158 2025 -6.015 2026 5.984 2027 -0.128 2028 2.471 2029 2.384