Year % of total labor force 1991 43.49306547378298 1992 43.45409332894982 1993 43.36542618623378 1994 43.327975431174465 1995 43.38775174019703 1996 43.36119920701639 1997 43.31684081210465 1998 43.312073082663 1999 43.32217345984755 2000 43.314761612967835 2001 43.29598766822504 2002 43.21871928980169 2003 43.11138216819959 2004 43.06248195295185 2005 43.06385009809373 2006 42.931323878992046 2007 42.831102669839005 2008 42.697571403645114 2009 42.57078127341478 2010 42.429014135874894 2011 42.37505566878786 2012 42.35273143919968 2013 42.35280670963199 2014 42.275068694315664 2015 42.31449282681676 2016 42.211678176982105 2017 41.98243630977057 2018 41.89445575596613 2019 41.74763516688468 2020 41.6679560166652 2021 41.71781335204367 2022 40.904467160482454 2023 41.04672927957957