Year % of total labor force 1992 1.1662038780943762 1993 1.1890040901740702 1994 1.2069627265770777 1995 2.1697679802854157 1996 2.1638480229198653 1997 2.8082825941663754 1998 3.3449982545190924 1999 2.840771722837387 2000 2.827935186132287 2001 3.115373047949186 2002 2.3990991925042016 2003 2.3594589436794835 2004 1.977910233125808 2005 2.2275736095837253 2006 2.235857027533991 2007 2.188859396888594 2008 2.169147867385149 2009 0.9122152463095192 2010 0.9370995363700044 2011 0.9127574974471314 2012 0.9166764063534841 2013 0.9067642344982987 2014 0.9051504190280721 2015 1.7774476080226693 2016 1.7861722786062362 2017 1.832177153208944 2018 1.8489692574192782 2019 1.8413705320870322 2020 1.8873844861713698