Year Percent of GDP (Units) 1996 65.134 1997 67.761 1998 64.330 1999 63.243 2000 64.679 2001 58.168 2002 57.099 2003 54.382 2004 51.714 2005 52.435 2006 48.402 2007 45.717 2008 41.335 2009 41.999 2010 44.809 2011 48.176 2012 51.797 2013 56.604 2014 58.101 2015 57.842 2016 59.624 2017 59.920 2018 60.223 2019 60.003 2020 71.608 2021 68.938 2022 71.142 2023 69.751 2024 69.550 2025 68.604 2026 67.412 2027 66.646 2028 65.976 2029 65.298