Year % of total labor force 1991 1.5346548241114433 1992 1.4238091633445416 1993 1.3709799819259358 1994 1.3537407589314663 1995 1.357776334554584 1996 1.3249162019143481 1997 1.294301335103552 1998 1.2814859499291102 1999 1.2497758141670579 2000 1.1787552829794705 2001 1.1336778243593202 2002 1.1264713523213052 2003 1.1145340482771746 2004 1.0749522682452441 2005 1.1031062673001326 2006 1.0584830785499766 2007 1.050581284334664 2008 1.0387520667930887 2009 1.0194698214359423 2010 1.01792231780509 2011 0.9892839783956697 2012 0.9796055200920707 2013 0.9602592407500483 2014 0.9414820606129294 2015 0.9143356998203617 2016 0.9063786213257398 2017 0.894659933639449 2018 0.8863018152892681 2019 0.8742942831608297 2020 0.8770321589676199