Year % of total labor force 1991 51.062275612755755 1992 50.962968960317376 1993 50.90096030575587 1994 50.87414786464441 1995 50.87053314785545 1996 50.8117560108817 1997 50.80545429562153 1998 50.856161426791815 1999 50.961385383352464 2000 50.987746095198375 2001 50.950242115084684 2002 50.93141969054283 2003 50.91851212330791 2004 50.69981059590641 2005 50.61169741287907 2006 50.51884179893072 2007 50.424875915875845 2008 50.33326620414189 2009 50.240844055706724 2010 50.14823379333816 2011 50.056342705728575 2012 49.96635318393389 2013 49.87599420299857 2014 49.7879779003645 2015 49.3297024416534 2016 48.86226462382954 2017 48.38341751351526 2018 47.897100614294466 2019 48.079747410166604 2020 48.06086508262727 2021 48.094769737532026 2022 47.91874257489088 2023 47.92078392056418