Year	% of GDP
1972	10.672478871262694
1973	10.827397853556047
1974	11.121314644755921
1975	11.085409252669038
1976	11.661721500805694
1977	13.093741033056036
1978	7.900577114628502
1979	8.137050097268808
1980	8.813908611185084
1981	8.643894326971587
2003	13.746465776674896
2004	14.495859325418326
2005	14.534953963974456
2006	15.238356084697122
2007	16.385000548022155
2008	16.130515984298267
2009	14.161970190710665
2010	14.425098400860714
2011	14.7879787886259
2012	14.747472315507052
2013	15.063241908814854
2014	16.54263824344873
2015	17.344472061159387
2020	15.066131552102998