Year Percent of GDP (Units) 1990 26.820 1991 25.969 1992 25.145 1993 23.766 1994 23.835 1995 25.874 1996 26.868 1997 25.910 1998 27.052 1999 26.026 2000 29.857 2001 23.076 2002 24.540 2003 30.956 2004 29.576 2005 31.904 2006 32.619 2007 35.862 2008 35.441 2009 35.599 2010 36.045 2011 30.815 2012 30.758 2013 30.559 2014 27.163 2015 43.772 2016 59.628 2017 50.714 2018 44.740 2019 39.562 2020 59.230 2021 58.757 2022 62.556 2023 43.678 2024 41.330 2025 40.382 2026 40.115 2027 40.125 2028 39.995 2029 39.780