Year % of total employment (modeled ILO estimate) 1991 18.053992490702463 1992 18.030935508420196 1993 18.030319251054035 1994 18.0581759817095 1995 18.13533475053542 1996 18.272074641440437 1997 18.449697610000513 1998 18.64449549184701 1999 18.863295017417435 2000 19.057777921367514 2001 19.295218774034407 2002 19.247356567733917 2003 19.24088151924902 2004 19.485693908325366 2005 19.764037777016913 2006 20.156047153308982 2007 20.57303037030189 2008 21.014778482989428 2009 21.415522786702937 2010 21.867515417991903 2011 22.24741942237266 2012 22.829180661443843 2013 23.16542483651185 2014 23.453468400887306 2015 23.649375335652397 2016 23.769297225035803 2017 24.075810198155803 2018 24.33422444907218 2019 24.481076596449984 2020 24.248213180318533 2021 24.467619940485807 2022 24.722146496844744