Year Percent of GDP (Units) 1996 137.922 1997 115.803 1998 119.301 1999 93.994 2000 56.422 2001 54.377 2002 49.960 2003 52.167 2004 45.466 2005 37.062 2006 32.992 2007 35.238 2008 31.428 2009 43.630 2010 38.276 2011 42.338 2012 45.540 2013 46.944 2014 48.016 2015 56.852 2016 74.500 2017 81.427 2018 83.178 2019 87.746 2020 83.345 2021 73.591 2022 64.070 2023 79.293 2024 79.794 2025 74.242 2026 65.953 2027 56.103 2028 51.416 2029 47.818