Year % of total labor force (modeled ILO estimate) 1991 2.059 1992 2.158 1993 2.539 1994 2.89 1995 3.15 1996 3.383 1997 3.374 1998 4.078 1999 4.677 2000 4.748 2001 5.02 2002 5.386 2003 5.251 2004 4.734 2005 4.446 2006 4.192 2007 3.888 2008 4.002 2009 5.068 2010 5.103 2011 4.55 2012 4.358 2013 4.038 2014 3.589 2015 3.385 2016 3.132 2017 2.822 2018 2.467 2019 2.351 2020 2.809 2021 2.828 2022 2.6 2023 2.575