Year % of total labor force 1991 48.623654601359945 1992 48.74900684355901 1993 48.89843547483464 1994 49.051318295722126 1995 49.196593307794544 1996 49.30532083965568 1997 49.38462856323548 1998 49.44847685690931 1999 49.51976320364954 2000 49.44594419794336 2001 49.36766609601991 2002 49.289510693589826 2003 49.214334457695315 2004 49.14139397895798 2005 49.072594553216916 2006 49.010168495000784 2007 48.95366995759128 2008 48.90198333951935 2009 48.85963393733976 2010 48.82156455614685 2011 48.79057997147795 2012 48.76434245843117 2013 48.73720725602036 2014 48.71162530380359 2015 48.69089186620788 2016 48.67062730611483 2017 48.90986459609741 2018 49.160781056942035 2019 49.42112450719512 2020 49.43663406573266 2021 49.77664260710403 2022 49.70980159115596 2023 49.78904664391746