Year Percent of GDP (Units) 1995 55.886 1996 54.975 1997 51.754 1998 48.872 1999 45.686 2000 40.004 2001 38.608 2002 38.714 2003 40.313 2004 40.980 2005 39.361 2006 36.802 2007 34.030 2008 39.324 2009 42.034 2010 45.821 2011 48.636 2012 52.196 2013 53.868 2014 55.105 2015 53.299 2016 51.536 2017 46.643 2018 42.945 2019 39.763 2020 44.775 2021 42.243 2022 41.019 2023 38.636 2024 39.086 2025 39.477 2026 40.057 2027 40.758 2028 41.849 2029 43.068