Year Percent of GDP (Units) 2000 30.637 2001 28.641 2002 28.435 2003 29.173 2004 32.048 2005 32.627 2006 30.700 2007 29.627 2008 29.910 2009 36.797 2010 44.580 2011 52.324 2012 57.483 2013 64.708 2014 68.765 2015 69.801 2016 67.544 2017 64.367 2018 61.131 2019 57.896 2020 69.740 2021 62.998 2022 53.073 2023 49.992 2024 46.943 2025 46.443 2026 45.780 2027 45.213 2028 44.621 2029 44.134