Year % of total labor force 1991 44.37005020696128 1992 44.359534496796066 1993 44.29861429986956 1994 44.301437920512484 1995 44.29850555297618 1996 44.29775805137922 1997 44.271443789449236 1998 44.27308593447854 1999 44.24344072361837 2000 44.22922576521679 2001 44.092191433068955 2002 43.95174709452284 2003 43.87235030418401 2004 43.73542943411594 2005 43.69269875833361 2006 43.61800286622988 2007 43.68980962566689 2008 43.62906169474606 2009 43.56663782997832 2010 43.503059514835456 2011 43.54359165616519 2012 43.584743384415454 2013 43.63204950110189 2014 43.70100355116382 2015 43.77063539422923 2016 43.848195459688085 2017 43.94350315376595 2018 44.06971990768157 2019 44.19061404356361 2020 44.11171462338025 2021 44.398503091409616 2022 44.24443441073948 2023 44.24297636456142