Year Percent change (Units) 1995 11.119 1996 12.103 1997 7.251 1998 18.463 1999 7.193 2000 9.873 2001 4.838 2002 3.873 2003 6.480 2004 9.256 2005 9.583 2006 9.447 2007 16.877 2008 13.774 2009 0.933 2010 9.230 2011 7.950 2012 6.619 2013 5.675 2014 6.480 2015 3.052 2016 3.130 2017 5.678 2018 3.885 2019 6.130 2020 2.931 2021 7.210 2022 11.593 2023 5.591 2024 4.800 2025 4.000 2026 4.000 2027 4.000 2028 4.000 2029 4.000