Year	% of GDP
1999	19.652446001980085
2000	21.830019409574533
2001	29.01577564293788
2002	21.12295888846307
2003	25.90327629539332
2004	16.145440240784197
2005	20.825564680705273
2006	19.032643650638683
2007	20.823017237160517
2008	22.385533329329334
2009	25.500502838180417
2010	25.649175741668895
2011	26.67132148715801
2012	23.449830060654644
2013	28.209237374994355
2014	27.96735935533504
2015	20.81883161799191
2016	17.511663983328628
2017	16.671137232855003
2018	15.607658095644675
2019	16.684952213837363