Year	% of GDP
2000	13.0724094559052
2001	13.7867448867298
2002	14.3731672510449
2003	14.9896090051878
2004	15.6575932554982
2005	16.5157762546404
2010	18.0910547409425
2011	18.8610370706422
2012	19.034604014622
2013	19.7553400233869
2014	19.8836147010763
2015	20.06721306944