Year	% of GDP
1991	5.207185334912864
1995	4.093422407035678
1996	4.180583330759058
1997	4.220690847211505
1998	3.794950477629736
1999	4.077959881162621
2000	3.755924154069931
2001	3.8859690307549877
2002	4.460277761391579
2003	4.403812779249353
2004	3.500411376193231
2005	3.8119443200834637
2006	4.215444196197178
2007	4.237068145951694
2008	4.083340410672061
2009	3.613237547643115
2010	4.45861353022589
2011	4.092637355568912
2013	3.422182501456668