Year Percent of total labor force (Units) 1992 3.178 1993 6.951 1994 6.951 1995 6.951 1996 20.711 1997 15.167 1998 13.958 1999 14.067 2000 14.342 2001 13.475 2002 12.492 2003 11.642 2004 11.742 2005 10.042 2006 7.033 2007 6.075 2008 7.750 2009 17.550 2010 19.475 2011 16.208 2012 15.048 2013 11.868 2014 10.847 2015 9.875 2016 9.642 2017 8.715 2018 7.415 2019 6.311 2020 8.099 2021 7.557 2022 6.851 2023 6.503 2024 6.452 2025 6.495 2026 6.401 2027 6.362 2028 6.323 2029 6.284