Year	% of GDP
1997	22.9102431739957
1998	27.8438276798192
1999	36.1657866003853
2000	58.2871099352368
2001	33.0072007758861
2002	16.2303148876098
2003	18.7179632179386
2004	24.0185544328379
2005	26.5568102543288
2006	23.1523287159223
2007	28.6118124640999
2008	36.8554609272784
2009	42.6475135196324
2010	52.9920294563929
2011	50.3240818382563
2012	53.8884461572093
2013	46.5836638216135
2014	49.2303706886333
2015	51.1046284842573
2016	52.3957267974158
2017	50.9131416909131
2018	51.5294416701038