Year Percent change (Units) 1996 14.314 1997 10.213 1998 11.913 1999 0.224 2000 14.527 2001 16.495 2002 12.169 2003 23.811 2004 10.008 2005 11.565 2006 8.500 2007 6.607 2008 15.052 2009 13.930 2010 11.816 2011 10.287 2012 11.979 2013 7.961 2014 7.978 2015 9.554 2016 18.546 2017 15.368 2018 11.442 2019 11.982 2020 15.754 2021 15.625 2022 21.345 2023 28.921 2024 23.958 2025 19.000 2026 17.000 2027 14.000 2028 14.000 2029 14.000