Year Percent of GDP (Units) 1992 66.770 1993 78.627 1994 75.237 1995 71.393 1996 68.261 1997 64.278 1998 60.279 1999 56.764 2000 52.354 2001 48.508 2002 49.081 2003 46.150 2004 44.156 2005 37.412 2006 31.549 2007 27.346 2008 33.313 2009 40.182 2010 42.588 2011 46.071 2012 44.894 2013 44.046 2014 44.270 2015 39.774 2016 37.193 2017 35.893 2018 34.000 2019 33.685 2020 42.275 2021 36.018 2022 29.830 2023 30.377 2024 29.189 2025 28.622 2026 28.646 2027 28.846 2028 29.135 2029 29.563