Year % of total labor force 1991 48.777101671249554 1992 48.6603011165427 1993 48.586901358659446 1994 48.526917693806844 1995 48.51456910956359 1996 48.59867083697239 1997 48.75088136807037 1998 48.908095769549135 1999 49.03792568597038 2000 49.21958580555991 2001 49.360844952445774 2002 49.47027316386461 2003 49.55376703500819 2004 49.61755809422668 2005 49.6823268615948 2006 49.743924575460234 2007 49.79214538315036 2008 49.82854681627739 2009 49.8506640081224 2010 49.88955912679485 2011 49.94855094808772 2012 50.00164434790643 2013 50.04359143334931 2014 50.09815357144532 2015 50.15165704350352 2016 50.20794658091191 2017 50.08113759835052 2018 49.79222463465046 2019 50.163274208935086 2020 50.11093067586041 2021 50.34757693184317 2022 50.27792991924542 2023 50.31097733340947