Year	% of GDP
1981	89.3810530862769
1982	85.9338986132771
1983	75.7531349894606
1984	58.9473786466933
1985	46.3908754259197
1986	54.9505865544931
1987	49.9877088280626
1988	43.6442191465521
1989	52.4886905592539
1990	53.1866852053115
1991	48.4057169769653
1992	43.7793889636332
1993	44.4888597528128
1994	42.0836208621839
1995	37.2396669802912
1996	36.6255576903107
1997	38.4774585386163
1998	40.6149508034533
1999	38.34181136256
2000	34.1095414105506
2001	30.9258898331291
2002	27.5825094191656
2003	29.3867983212595
2004	27.1179654228808
2005	26.1895896732185
2006	27.8655855383472
2007	21.244608870784
2008	19.8969960962373
2009	22.04953582307
2010	17.5621030023317
2011	16.3605620999512
2012	14.9588259144507
2013	14.9039059271535
2014	15.8027027733729
2015	15.4901040894639
2016	15.3667361456749
2017	15.4743276516864