Year	% of GDP
1997	14.870270476340702
1998	17.46275121010117
1999	16.013500807150102
2000	14.229941031709323
2001	17.04873280066615
2002	12.265284346836038
2003	8.013851344825033
2004	10.199152558829292
2005	12.054643013706464
2006	10.99115255688476
2007	12.894602613851852
2008	9.821333667571025
2009	11.144422974388256
2010	7.361357304835141
2011	6.055939563758391
2012	6.017584897954696
2013	6.594732725968906
2014	6.40878875319491