Year % of total labor force 1991 46.535004786914165 1992 46.54019658898309 1993 46.57026652074091 1994 46.60827061469172 1995 46.65541774048985 1996 45.95658135642633 1997 46.93340198509837 1998 46.77326528690404 1999 46.992364848334006 2000 47.02991614272872 2001 47.07012203718355 2002 46.25954507863321 2003 45.71973079867313 2004 45.63190798225664 2005 45.25279830319818 2006 45.30711123516721 2007 45.10677817399231 2008 44.69829698298043 2009 44.596071774529136 2010 43.831058489476874 2011 44.36022368205039 2012 44.10964310522462 2013 43.95158921652621 2014 43.86983993315231 2015 43.25061971809647 2016 43.138463229599154 2017 43.56027944288118 2018 43.31763724079917 2019 43.143294650033035 2020 43.03249552974726 2021 42.022028364549655 2022 42.661605272490526 2023 42.7688318518616