Year	% of GDP
1990	19.6960758447937
1991	15.5127799697271
1992	15.2196593371554
1993	14.8211584821029
1994	16.5897991619713
1995	17.7654225765924
1996	18.1363977401359
1997	35.3211428464868
1998	38.3441726102392
1999	38.5207474963395
2000	36.8161757289218
2001	33.0771940165128
2002	37.4801493239179
2003	41.2101100476705
2004	39.936373756975
2005	39.4303661485987
2006	40.0763795827211
2007	39.0328109191471
2008	41.1794673704537
2009	33.8700651366124
2010	36.4035157412246
2011	36.6079589075636
2012	37.83693311378
2013	36.1640806957943
2014	32.6118757275628
2015	29.1887448991072
2016	25.8931202446658
2017	30.331890207943
2018	38.0430174395803