Year Percent of GDP (Units) 1991 15.908 1992 21.036 1993 20.274 1994 21.599 1995 24.062 1996 23.058 1997 22.943 1998 28.046 1999 30.619 2000 36.108 2001 37.036 2002 38.806 2003 38.264 2004 30.412 2005 26.274 2006 22.162 2007 19.481 2008 21.213 2009 21.124 2010 20.223 2011 21.299 2012 19.280 2013 18.630 2014 20.264 2015 37.709 2016 43.726 2017 52.629 2018 45.261 2019 45.096 2020 48.024 2021 48.537 2022 44.097 2023 40.447 2024 43.953 2025 47.634 2026 51.845 2027 55.646 2028 59.542 2029 63.095