Year Percent change (Units) 1992 1.772 1993 5.874 1994 -3.061 1995 9.820 1996 5.819 1997 -4.045 1998 2.778 1999 3.673 2000 -3.918 2001 -0.799 2002 1.381 2003 6.928 2004 4.733 2005 8.566 2006 18.333 2007 -1.969 2008 -0.331 2009 0.098 2010 2.620 2011 4.173 2012 4.470 2013 4.151 2014 4.275 2015 5.376 2016 1.261 2017 6.271 2018 4.773 2019 3.146 2020 -0.429 2021 0.737 2022 6.364 2023 4.811 2024 5.052 2025 5.548 2026 4.464 2027 5.596 2028 4.294 2029 2.166