Year Percent change (Units) 1994 16.041 1995 11.628 1996 2.774 1997 7.353 1998 -10.705 1999 9.847 2000 13.578 2001 10.139 2002 7.981 2003 27.647 2004 23.838 2005 13.790 2006 25.933 2007 14.492 2008 3.987 2009 -15.851 2010 18.512 2011 11.777 2012 9.362 2013 5.193 2014 4.233 2015 6.243 2016 4.357 2017 3.533 2018 4.727 2019 0.330 2020 -4.808 2021 11.338 2022 1.519 2023 0.443 2024 3.745 2025 3.569 2026 3.430 2027 3.409 2028 3.343 2029 3.314