Year Percent of total labor force (Units) 1980 1.600 1981 2.200 1982 3.100 1983 3.700 1984 3.800 1985 3.600 1986 3.100 1987 3.800 1988 2.676 1989 2.348 1990 2.723 1991 3.151 1992 3.290 1993 3.958 1994 3.850 1995 4.242 1996 4.717 1997 4.758 1998 4.708 1999 4.142 2000 3.883 2001 4.008 2002 4.392 2003 4.792 2004 5.892 2005 6.033 2006 5.633 2007 5.192 2008 4.433 2009 5.717 2010 5.183 2011 4.892 2012 5.242 2013 5.350 2014 6.042 2015 6.150 2016 6.475 2017 5.933 2018 5.208 2019 4.808 2020 5.475 2021 6.175 2022 4.767 2023 5.100 2024 5.398 2025 5.203 2026 5.156 2027 5.113 2028 5.110 2029 5.110