Year % of total employment 1995 36.59 1996 34.55 1997 33.36 1998 34.4 1999 34.74 2000 31.82 2001 32.04 2002 33.54 2003 38.64 2004 35.88 2005 36.98 2006 38.16 2007 38.4 2008 35.2 2009 38.85 2010 39.8 2011 39.43 2012 39.26 2013 40.41 2014 37.21 2015 37.52 2016 37.49 2017 37.31 2018 37.27 2019 37.11 2020 39.66 2021 48.03 2022 50.29 2023 50.04