Year	% of central government expense
1998	27.718219612674577
1999	30.38528562483292
2009	28.949344636406764
2010	24.314794364725024
2012	31.268075370057442
2013	30.414580742098146
2014	15.451838989629737
2015	17.50099376319335
2016	19.513385968055367