Year Percent of GDP (Units) 1995 39.870 1996 48.203 1997 43.034 1998 42.037 1999 27.961 2000 22.903 2001 13.713 2002 33.977 2003 24.887 2004 22.005 2005 17.289 2006 14.446 2007 18.911 2008 20.099 2009 26.307 2010 23.690 2011 26.024 2012 32.882 2013 39.593 2014 27.442 2015 35.247 2016 34.620 2017 34.805 2018 41.067 2019 38.678 2020 40.588 2021 31.273 2022 25.851 2023 29.563 2024 31.582 2025 33.384 2026 34.230 2027 35.368 2028 35.829 2029 35.741