Year Percent change (Units) 1994 -3.066 1995 16.486 1996 20.174 1997 7.747 1998 -5.582 1999 -3.859 2000 10.185 2001 19.313 2002 5.187 2003 9.416 2004 25.757 2005 15.414 2006 21.594 2007 8.205 2008 2.663 2009 -19.663 2010 19.226 2011 9.332 2012 2.748 2013 4.510 2014 4.616 2015 8.587 2016 4.417 2017 4.266 2018 3.733 2019 2.038 2020 -7.019 2021 11.919 2022 2.620 2023 -6.163 2024 6.923 2025 3.246 2026 3.180 2027 3.206 2028 3.095 2029 3.057