Year Percent of GDP (Units) 2000 5.353 2001 11.470 2002 17.291 2003 19.673 2004 20.469 2005 20.428 2006 22.483 2007 25.283 2008 26.661 2009 31.887 2010 28.876 2011 28.643 2012 27.553 2013 25.882 2014 25.064 2015 25.669 2016 26.772 2017 26.748 2018 26.601 2019 26.995 2020 25.641 2021 27.792 2022 28.152 2023 29.497 2024 28.716 2025 28.394 2026 28.271 2027 28.053 2028 27.937 2029 27.912