Year Percent of GDP (Units) 1996 29.823 1997 31.233 1998 36.779 1999 34.360 2000 34.852 2001 33.509 2002 37.830 2003 39.782 2004 38.744 2005 31.670 2006 26.729 2007 25.068 2008 22.954 2009 23.682 2010 23.402 2011 23.795 2012 24.861 2013 24.397 2014 24.174 2015 23.264 2016 21.790 2017 22.641 2018 21.089 2019 20.835 2020 25.543 2021 26.327 2022 25.665 2023 25.851 2024 26.361 2025 26.155 2026 25.489 2027 25.054 2028 25.009 2029 25.090