Year Percent change (Units) 2001 -9.157 2002 1.242 2003 4.555 2004 -1.176 2005 5.986 2006 18.433 2007 8.130 2008 19.529 2009 -1.079 2010 8.217 2011 3.793 2012 3.773 2013 -1.246 2014 0.898 2015 19.266 2016 5.771 2017 5.571 2018 9.072 2019 10.510 2020 1.518 2021 5.074 2022 11.684 2023 4.646 2024 1.021 2025 2.090 2026 1.756 2027 1.561 2028 1.522 2029 1.522