Year Percent of GDP (Units) 1990 22.593 1991 25.084 1992 26.537 1993 26.879 1994 23.909 1995 25.074 1996 22.228 1997 29.697 1998 45.497 1999 25.497 2000 20.297 2001 27.833 2002 25.722 2003 21.250 2004 20.874 2005 20.768 2006 21.135 2007 19.388 2008 18.929 2009 22.598 2010 23.091 2011 22.074 2012 23.950 2013 34.675 2014 23.755 2015 22.253 2016 21.848 2017 18.114 2018 17.130 2019 17.461 2020 19.811 2021 16.594 2022 19.101 2023 21.684 2024 22.965 2025 23.879 2026 24.307 2027 24.795 2028 25.204 2029 25.715