Year % of total labor force 1995 1.3742286323807529 1996 2.046166634695313 1997 1.972411210286499 1998 1.9373666527699438 1999 1.9118174214362529 2000 1.8700545822181183 2001 1.8311140612393209 2002 0.505300035932447 2003 0.4971853783304515 2004 0.4670232697059382 2005 0.45840995709069593 2006 0.45004500450045004 2007 0.4421843908910016 2008 0.5063162957899799 2009 0.4295425371978842 2010 0.42165543886486434 2011 0.4086675993903641 2012 0.40111935896407386 2013 0.6046230407888005 2014 0.594971121017126 2015 0.5860396343112682 2016 0.5769879453903102 2017 0.4368605453767048 2018 0.559450189567545 2019 0.8496104536070211 2020 0.9032770892799075