Year % of total labor force 1991 43.87118803009152 1992 43.85702659286705 1993 43.78982089439524 1994 43.82679086928533 1995 43.96367515649767 1996 43.936701377712964 1997 43.89303750660709 1998 43.85262540815167 1999 43.90833925776951 2000 43.95185244687911 2001 43.93286902209609 2002 43.87696429826126 2003 43.81451053952965 2004 43.754846149098796 2005 43.68931812233253 2006 43.49451327717164 2007 43.37368309771189 2008 43.274636746936594 2009 43.18926914484684 2010 43.11138733451927 2011 43.08107301377201 2012 43.11102091408 2013 43.21110065495002 2014 43.31478920478149 2015 43.552452270102044 2016 43.59327955824528 2017 43.6367576944666 2018 43.61887215036211 2019 43.60090630039761 2020 43.5398493944225 2021 43.598200239880576 2022 43.200433573429656 2023 43.21015157393399