Year Percent of GDP (Units) 1990 13.180 1991 12.294 1992 12.019 1993 11.223 1994 9.954 1995 8.780 1996 8.080 1997 10.025 1998 14.321 1999 16.335 2000 16.682 2001 17.229 2002 17.041 2003 19.803 2004 22.422 2005 25.899 2006 28.121 2007 27.431 2008 26.949 2009 29.984 2010 29.490 2011 33.061 2012 35.039 2013 37.686 2014 39.707 2015 40.784 2016 41.217 2017 40.050 2018 40.022 2019 42.125 2020 48.698 2021 51.255 2022 53.803 2023 55.183 2024 56.633 2025 57.268 2026 57.867 2027 58.410 2028 58.913 2029 59.402