Year	% of central government expense
1990	14.358279558217998
1991	11.940223099289181
1992	8.797901349582379
1993	9.570003882965125
1994	6.877742546220598
1995	6.188991553301096
1996	5.311108548315632
2006	2.2892993658241343
2007	3.2066241594790807
2008	18.86064218175245
2009	7.134851678244165
2010	3.6517883650672864
2011	2.632765106312192
2012	1.6668781298559556
2013	2.5514706756919416
2014	2.204886135568397
2015	1.5503529227966402
2016	2.242219033860756
2017	2.251453426669265
2018	1.7342611538734964
2019	1.4045642282998378
2020	1.55901997039923
2021	1.811547697295758
2022	1.7556149673220764