Year % of GDP 1975 14.436898162386003 1976 8.768116827445049 1977 11.482818469411479 1978 5.408398127626259 1979 8.25537920119132 1980 6.324054886586401 1981 5.70335692451739 1982 5.554915501266613 1983 4.256864343233463 1984 6.745700969467144 1985 8.034206291830882 1986 6.928619672150381 1987 7.570857908847185 1988 9.964098036902728 1989 11.40509866540974 1990 10.533404206912673 1991 11.862601723810508 1992 6.932544440975784 1993 12.836353012577154 1994 19.07726847262248 1995 17.625605325283487 1996 18.09530985915493 1997 10.410867657687023 1998 18.031633175300644 1999 9.363192271061916 2000 15.265862335030981 2001 21.09272209993512 2002 18.75432273136589 2003 21.156288220358324 2004 22.87169147747137 2005 19.207310517402696 2006 17.411536288962417 2007 6.743782057315449 2008 4.340973869627741 2009 11.03620335548306 2010 4.870860829152317 2011 3.8817620783489 2012 5.2675191854576315 2013 15.194813255798964 2014 18.232905467114968 2015 21.10305209080175 2016 18.63519706561577 2017 15.859632293630598 2018 19.99788317212749 2019 17.59063931309526 2020 21.075519516848225 2021 15.594465710609532 2022 17.82982109939092