Year	% of GDP
1992	10.5606479060711
2000	13.7485044061291
2001	14.3001104857638
2011	16.9794441213752
2012	17.1332601154634
2013	17.2942817184637
2014	17.344748336043
2015	17.9695712637788
2016	17.8361279420494