Year % of total employment (modeled ILO estimate) 1991 2.26520925619559 1992 2.49921990211375 1993 2.70712928841365 1994 2.87407257097897 1995 2.95377463748671 1996 3.06036212062003 1997 3.17559385006094 1998 3.15833202789604 1999 3.85594242073632 2000 4.12810473755078 2001 4.3774250847046 2002 3.15198027994988 2003 3.3229327566677 2004 3.14393822552618 2005 3.35655336296755 2006 3.31876085697742 2007 3.23911920480929 2008 3.46670557127314 2009 3.76819307600319 2010 3.93621412892595 2011 3.6597796458758 2012 3.89902958781591 2013 4.20099427127137 2014 3.97962407726147 2015 4.30191848353638 2016 4.23396627797038 2017 4.25617863994791 2018 4.29149344918076 2019 4.09088655455845 2020 4.62737323103455 2021 4.74725724252737 2022 4.61226888924104