Year Percent of total labor force (Units) 1984 1.620 1985 2.220 1986 2.750 1987 2.640 1988 2.890 1989 2.860 1990 2.590 1991 2.670 1992 2.790 1993 2.830 1994 4.470 1995 7.420 1996 4.998 1997 4.770 1998 5.460 1999 6.360 2000 6.080 2001 8.100 2002 9.060 2003 9.670 2004 9.860 2005 11.240 2006 10.280 2007 9.110 2008 8.390 2009 7.870 2010 7.140 2011 6.560 2012 6.140 2013 6.250 2014 5.940 2015 6.180 2016 5.610 2017 5.500 2018 5.240 2019 5.180 2020 7.070 2021 6.490 2022 5.860 2023 5.320 2024 5.200 2025 5.100 2026 5.100 2027 5.100 2028 5.100 2029 5.100