Year	% of GDP
1977	37.9019079826902
1978	37.1735796205151
1979	29.403776453084
1980	30.244673807142
1981	31.1064317227178
1982	36.1002747247353
1983	35.1600707574927
1984	35.7550826616278
1985	38.2635664401907
1986	43.0026780833142
1987	43.4812687872129
1988	45.1296856287617
1989	47.9891069556906
1990	46.7168165383718
1991	46.3339344074347
1992	45.5688883602895
1993	57.6453189261977
1994	54.4341142346582
1995	53.8558250559767
1996	58.8179770696512
1997	65.6457119393764
1998	66.2313771196348
1999	66.180134887496
2000	72.3830084156637
2001	77.301881448418
2002	77.0065460528503
2003	70.3550279219855
2004	68.5325283400887
2005	61.4303821497078
2006	69.8390302041069
2007	75.8968160591223
2008	79.6587821375681
2009	87.8416629210677
2010	92.8268927305761
2011	95.6600453702034
2012	91.2022764808765
2013	79.3615415988832
2014	68.4317549884338
2015	56.9179694473992
2016	53.3424751002502
2017	48.8089206543048
2018	45.3953834916201