Year Percent of GDP (Units) 1991 0.515 1992 1.189 1993 1.717 1994 18.577 1995 22.118 1996 25.018 1997 25.346 1998 22.600 1999 20.739 2000 16.510 2001 20.864 2002 25.287 2003 25.159 2004 25.425 2005 25.704 2006 32.535 2007 40.668 2008 42.458 2009 46.606 2010 35.058 2011 50.718 2012 53.710 2013 61.937 2014 68.207 2015 47.321 2016 32.586 2017 30.921 2018 36.832 2019 40.385 2020 28.640 2021 41.568 2022 45.752 2023 44.527 2024 47.601 2025 49.986 2026 51.491 2027 53.045 2028 54.753 2029 56.537