Year Percent of GDP (Units) 1984 4.664 1985 5.363 1986 5.577 1987 7.432 1988 8.257 1989 8.512 1990 9.709 1991 12.511 1992 12.479 1993 12.139 1994 10.853 1995 13.166 1996 15.144 1997 13.494 1998 14.087 1999 15.335 2000 20.365 2001 20.059 2002 20.888 2003 21.937 2004 23.192 2005 23.119 2006 22.017 2007 24.900 2008 22.181 2009 21.469 2010 22.667 2011 22.707 2012 26.801 2013 28.948 2014 24.932 2015 24.152 2016 24.750 2017 24.622 2018 25.266 2019 26.345 2020 27.352 2021 26.752 2022 27.130 2023 28.135 2024 28.562 2025 29.590 2026 30.398 2027 30.780 2028 30.693 2029 30.650