Year	% of GDP
1972	17.789227166276348
1973	18.95248849127074
1974	17.864065124693113
1975	20.225106236361547
1976	19.948266942576307
1977	21.26921848624481
1978	22.617657715689038
1979	21.796714579055443
1980	20.991385397542718
1981	21.638635271504082
1982	22.781200566147696
1983	23.067694641943508
1984	22.97891585053958
1985	21.999629539917073
1986	22.516898497290654
1987	20.561771184647743
1988	20.50088908389719
1989	20.15140929519599
1990	19.95340107436412
1991	20.38441074753924
1992	20.49935063987509
1993	21.007979267544158
1994	20.7641427107969
1995	20.48581381437737
1996	19.837619254915744
1997	18.441033151145863
1998	19.183163830429965
1999	19.131166454779944
2000	19.292368533706604
2001	19.59749766902704
2002	19.540624658067184
2003	18.745264776723623
2004	18.67219382828894
2005	18.877504716868476
2006	18.51071548773718
2007	19.06787393837299
2008	20.49980822532439
2009	20.048161807311867
2010	19.199750829309007
2011	20.174855935005432
2012	20.11548772384712