Year Percent of total labor force (Units) 1999 14.600 2000 16.375 2001 17.362 2002 13.737 2003 12.441 2004 10.884 2005 8.324 2006 5.778 2007 4.248 2008 5.827 2009 13.787 2010 17.814 2011 15.390 2012 13.366 2013 11.770 2014 10.699 2015 9.119 2016 7.861 2017 7.073 2018 6.146 2019 6.254 2020 8.488 2021 7.113 2022 5.925 2023 6.558 2024 6.300 2025 6.100 2026 6.000 2027 6.000 2028 6.040 2029 6.000