Year % of total employment (modeled ILO estimate) 1991 21.4959412735514 1992 21.8309385243388 1993 21.9071563005215 1994 21.9421529401187 1995 21.9753704566554 1996 22.1331184513918 1997 22.4107945287759 1998 22.8151777041759 1999 22.9173960120568 2000 23.2307736136632 2001 23.7681960886785 2002 24.0483575811157 2003 25.1634428373925 2004 25.3703714432056 2005 25.645032012005 2006 25.7232610381649 2007 26.4468152727031 2008 26.7094037112933 2009 26.9528082994671 2010 27.40025574646 2011 28.1243898548216 2012 28.5996715642447 2013 29.2780276170207 2014 29.6753144729993 2015 30.3820105716444 2016 30.9492325309575 2017 31.3492950638421 2018 31.9434022152044 2019 32.1902837430413 2020 31.7997678953854 2021 31.9732367084691 2022 32.4441703962466