Year	% of GDP
1988	29.21769289581958
1989	33.268336430441174
1990	29.24751268300789
1991	30.30205330868105
1992	29.02054069593744
1993	24.766976425873477
1994	24.719918443667787
1995	25.340638170815495
1996	22.985507952806987
1997	22.335581529887456
1998	23.07057887210199
1999	26.176665745831773
2000	26.097653044258557
2001	24.25398391681228
2002	24.899956837719714
2003	27.52963374685497
2004	27.549324533219842
2005	26.658666078727535
2006	26.948207231791223
2007	28.465413752566754
2008	27.690755318695388
2009	28.179410860159464
2010	27.415561015377943
2011	25.965123187340154
2012	26.228668281229726
2013	27.720165156180453
2014	26.701805351814865
2015	27.46533101454205
2016	28.386540526841042
2017	29.59188234785557
2018	31.026509346749716
2019	30.787956083687806
2020	29.25379581251037