Year	% of GDP
1990	18.487623791982895
1991	16.908919992121557
1992	13.710483342597726
1993	13.111149717290788
1994	13.596176876371219
1995	15.563809268860426
1996	15.34627819712386
1997	16.492012201260188
1998	15.701910001162917
1999	18.433917555011007
2000	22.780880614538273
2001	18.708795453242935
2002	18.056043699061608
2003	20.612272324034006
2004	21.993687537064144
2005	21.467195855899458
2006	23.893128444435423
2007	27.384724787721265
2008	18.5542331555049
2009	15.400656627031816
2010	20.19947491615386
2011	20.090824576724795
2012	17.758536514681
2013	15.723097366089833
2014	18.586181087319492
2015	18.069166288935566
2016	19.265486386949163
2017	21.00779809366174