Year % of total employment (modeled ILO estimate) 1991 23.937249574563758 1992 23.82406440355277 1993 23.941340910887455 1994 24.079069807109832 1995 24.247135379014516 1996 24.554533296934096 1997 24.693024188424904 1998 24.878058235088 1999 25.151193384988186 2000 25.3308768529618 2001 25.360149850305863 2002 25.529000869756103 2003 25.759781281212742 2004 25.9716014084686 2005 26.233857028619486 2006 26.85968250747843 2007 27.429300176338362 2008 28.159536930198065 2009 28.53774833415054 2010 29.09330780776161 2011 29.864249115554784 2012 30.55482255083934 2013 30.550350485985692 2014 31.099104409047918 2015 31.532984959694012 2016 32.00949762577677 2017 32.496486404704825 2018 33.09705182438806 2019 33.79459430599047 2020 33.416601784844595 2021 33.68037600863291 2022 34.138068761850086