Year	% of GDP
1977	19.3615679447544
1978	29.8143584583271
1979	27.2932827416074
1980	29.6586249823137
1981	29.3661885736292
1982	24.8839142962862
1983	16.1150840599114
1984	16.8011273021949
1985	17.9450854564139
1986	18.2646491405344
1987	17.698838578417
1988	21.3197430477427
1989	24.7739637537214
1990	19.7589607253021
1991	19.9175131249825
1992	21.2641149278264
1993	22.7903924818551
1994	22.6188299308109
1995	19.9299934487589
1996	20.0250194652699
1997	21.4553068202358
1998	20.4395658229958
1999	22.4741676182655
2000	21.7829072053036
2001	21.3115157944929
2002	19.1329320826226
2003	17.1240580562592
2004	16.85556129512
2005	26.5542739041691
2006	35.5204782766736
2007	26.1169905700353
2008	29.5350375282274
2009	26.6621259510442
2010	24.9054395868718
2011	25.1522741944083
2012	24.6123773376858
2013	20.8151582143069
2014	17.3809706190207
2015	17.4858395756885
2016	21.7802373611496