Year % of total labor force 1991 1.5406171889880513 1992 1.4665250212662235 1993 1.3848075991215179 1994 1.331432675773157 1995 1.404010145234639 1996 1.3805745052640466 1997 1.310895160094832 1998 1.3010135436643606 1999 1.2621486193129534 2000 1.177170154745916 2001 1.159384326161648 2002 1.158834674792047 2003 1.1335541034058032 2004 1.0732651786769885 2005 1.109421272367764 2006 1.025041512368812 2007 1.0164934629680487 2008 1.0061826240673934 2009 0.9781750082329834 2010 0.9819585937133485 2011 0.9481163692282017 2012 0.9318396910331507 2013 0.8938484891154607 2014 0.8878612170054 2015 0.8832183356574956 2016 0.877778680563241 2017 0.8558439891189633 2018 0.843682753655147 2019 0.8411911789383488 2020 0.8425640945602668