Year	Percent of GDP
1990-01-01	13.369
1991-01-01	12.479
1992-01-01	12.207
1993-01-01	11.408
1994-01-01	10.129
1995-01-01	8.945
1996-01-01	8.243
1997-01-01	10.245
1998-01-01	14.668
1999-01-01	16.748
2000-01-01	17.114
2001-01-01	17.702
2002-01-01	17.551
2003-01-01	20.449
2004-01-01	23.251
2005-01-01	26.959
2006-01-01	29.272
2007-01-01	28.651
2008-01-01	28.162
2009-01-01	31.380
2010-01-01	30.825
2011-01-01	31.511
2012-01-01	32.201
2013-01-01	35.390
2014-01-01	37.314
2015-01-01	39.526
2016-01-01	39.889
2017-01-01	39.529