Year % of total labor force 1991 49.842067185522524 1992 49.87474683674129 1993 49.886758772372836 1994 49.8581160790386 1995 49.84129978279624 1996 49.84647029311916 1997 49.8726557104003 1998 49.890209798072775 1999 49.91155304949268 2000 49.92211993427006 2001 49.9229894950181 2002 50.03831012074175 2003 50.16356726992727 2004 50.29880229375768 2005 50.43104449285609 2006 50.56351231738242 2007 50.443226218744165 2008 50.31875740558828 2009 50.211265120882544 2010 50.09611191621821 2011 49.948198139999256 2012 49.771094879811514 2013 49.560668648503295 2014 49.32099101292429 2015 49.23439185630018 2016 49.12626610928332 2017 49.01270417916426 2018 48.91247010668873 2019 48.83338690201855 2020 48.71083829051933 2021 48.84237262734969 2022 48.6915067555157 2023 48.71330100032118