Year	% of GDP
1977	4.54958009719849
1982	5.44717502593994
1986	5.33006000518799
1996	4.67156982421875
2001	6.19316005706787
2004	5.37147998809814
2005	4.79442977905273
2006	4.71720290184021
2008	4.466135025024415
2009	4.509464979171755
2012	4.74210977554321
2017	3.73344993591309
2019	3.558979988098145