Year % of total employment (modeled ILO estimate) 1991 15.256066731681491 1992 15.343297084377799 1993 15.84169412461587 1994 15.254162238753077 1995 13.746116216037572 1996 17.05648738506439 1997 18.232623404272452 1998 17.155101783575958 1999 17.40600755918042 2000 17.67980489578284 2001 17.88896652571983 2002 18.135735060088862 2003 18.26430806698706 2004 18.181646442447597 2005 18.1103377159062 2006 18.00371124147013 2007 17.91159872410528 2008 17.88578524070991 2009 17.982134524365 2010 18.06818545249088 2011 18.08153351962605 2012 18.15678835110748 2013 18.23742759703353 2014 18.422142994796722 2015 18.87968174062236 2016 19.30379600250137 2017 19.62074938462944 2018 19.61504968181311 2019 19.46847119642254 2020 20.03134912882907 2021 19.92508588592914 2022 19.79228026662533