Year	% of GDP
1970	8.549497088406563
1971	7.728098048116205
1972	8.814988290398126
1973	10.674889255624077
1974	10.45354696989275
1975	12.323417939588836
1976	11.64511122607346
1977	10.876408595282632
1978	11.719473408752364
1979	12.036276522929501
1980	13.280610083321564
1981	14.76453628063431
1982	15.402547664640744
1983	14.759796051586951
1984	15.588547189819725
1985	13.293817591154552
1986	12.141346852131166
1987	11.266536408099261
1988	11.54654411934508
1989	12.52254976589954
1990	15.62636445167673
1991	15.920295457568503
1992	17.1079667002291
1993	12.844574780058652
1994	13.32930541678787
1995	11.915763145239799
1996	12.200216088071624
1997	19.50975008063321
1998	18.362702648273086
1999	20.393668383806464
2000	21.148423219879454
2001	21.085225411385228
2002	20.70106865403086
2003	19.050580665588637
2004	18.613489192425043
2005	18.313938047813522
2006	19.463353600167846
2007	20.177236711488135