Year Percent of GDP (Units) 1999 25.520 2000 38.815 2001 35.263 2002 33.790 2003 32.637 2004 30.663 2005 29.597 2006 22.313 2007 19.820 2008 18.593 2009 21.012 2010 21.696 2011 26.072 2012 29.491 2013 30.231 2014 33.704 2015 36.157 2016 37.116 2017 38.745 2018 39.178 2019 39.836 2020 50.092 2021 51.887 2022 50.617 2023 53.458 2024 53.481 2025 53.376 2026 52.794 2027 52.006 2028 51.299 2029 51.332