Year % of total labor force 1991 47.15260019217375 1992 47.27268470253631 1993 47.341853012126315 1994 47.35283854799996 1995 47.32181988457333 1996 47.32499268413661 1997 47.31957837035953 1998 47.32313326055851 1999 47.3292262801706 2000 47.31147469400019 2001 47.254569627832865 2002 47.210914859610675 2003 47.18101726268664 2004 47.11835648624822 2005 47.05517099276601 2006 46.988475795166494 2007 46.91515364533725 2008 46.76693852029944 2009 46.46579191829501 2010 46.143470508127244 2011 45.854005082551716 2012 45.881212205809774 2013 45.905219931081355 2014 45.96035173459148 2015 45.80926918068787 2016 45.79746040493821 2017 46.0931761579572 2018 44.53012360478867 2019 45.22771800999567 2020 44.93109400176944 2021 44.61759757193804 2022 45.09780214165063 2023 45.03123654518963