Year Percent of GDP (Units) 1982 24.276 1983 24.695 1984 23.452 1985 22.498 1986 22.344 1987 20.435 1988 18.185 1989 18.595 1990 18.207 1991 16.643 1992 14.749 1993 13.530 1994 12.469 1995 11.177 1996 11.095 1997 11.627 1998 12.735 1999 15.025 2000 16.268 2001 17.440 2002 18.464 2003 18.228 2004 17.871 2005 18.267 2006 18.339 2007 18.151 2008 22.525 2009 25.654 2010 25.094 2011 27.119 2012 28.159 2013 28.564 2014 28.890 2015 31.552 2016 32.316 2017 32.635 2018 33.277 2019 34.153 2020 35.403 2021 32.686 2022 33.481 2023 33.856 2024 33.564 2025 33.954 2026 34.347 2027 34.530 2028 34.714 2029 34.840