Year Percent of GDP (Units) 1998 33.961 1999 35.597 2000 32.517 2001 32.290 2002 34.925 2003 33.595 2004 31.379 2005 29.743 2006 28.196 2007 27.513 2008 31.431 2009 34.373 2010 34.458 2011 35.698 2012 35.639 2013 38.364 2014 41.053 2015 44.898 2016 47.197 2017 44.514 2018 43.644 2019 43.267 2020 50.210 2021 49.276 2022 48.079 2023 47.880 2024 50.335 2025 50.193 2026 50.205 2027 50.406 2028 50.584 2029 50.842