Year	% of GDP
1990	34.712310902374824
1991	32.61814312189558
1992	31.68139668624883
1993	30.265313705359954
1994	28.461800211350162
1995	26.387810878230784
1996	27.747241224304236
1997	28.219951470020803
1998	36.01452620310033
1999	37.96014814257295
2000	37.58584190192351
2001	39.475556873966205
2002	38.0769603361761
2003	41.275761575615824
2004	36.58765032750607
2005	40.44313114562629
2006	44.12738603430906
2007	44.78966392892521
2008	49.36324522881951
2009	40.67650040619566
2010	47.96900747764004
2011	46.75369749556301
2012	45.99485479509467
2013	43.14924613859823
2014	40.37161684732828
2015	41.97762980649527
2016	38.76412975988977
2017	37.9203845284666