Year Percent change (Units) 2005 0.186 2006 22.293 2007 5.136 2008 3.853 2009 18.311 2010 -5.592 2011 -0.972 2012 0.321 2013 -1.754 2014 9.987 2015 3.510 2016 8.215 2017 1.580 2018 -11.867 2019 4.413 2020 -0.741 2021 2.012 2022 1.066 2023 5.978 2024 3.440 2025 2.546 2026 2.782 2027 2.278 2028 2.114 2029 2.000