Year Percent of GDP (Units) 1995 42.025 1996 43.296 1997 45.951 1998 39.094 1999 33.019 2000 34.025 2001 29.508 2002 30.739 2003 33.504 2004 34.808 2005 37.119 2006 40.297 2007 42.712 2008 41.498 2009 45.300 2010 34.096 2011 32.562 2012 33.668 2013 32.442 2014 33.392 2015 31.904 2016 30.118 2017 30.978 2018 31.529 2019 31.985 2020 36.686 2021 34.581 2022 36.425 2023 37.754 2024 36.763 2025 36.398 2026 36.939 2027 36.599 2028 36.096 2029 35.998