Year	% of GDP
1990	30.024725731054286
1991	35.15148269479708
1992	37.150962668990964
1993	41.45904274512658
1994	40.64624137480164
1995	39.81112887166861
1996	34.151100628718815
1997	33.45129846232492
1998	40.13829379213693
1999	35.453032465245826
2000	32.74950552821217
2001	36.15311778887083
2002	36.53222823450605
2003	36.34091701965373
2004	35.783081201799114
2005	33.38337460390382
2006	33.335606952948375
2007	33.27707452318746
2008	33.23161357227335
2009	33.195263451004145
2010	33.16554322160923
2011	33.140790633627226
2012	39.26121228780012
2013	39.32060116492789
2014	38.435168164638675
2015	41.927903247869835
2016	45.006818844899335
2017	43.11489267339596
2018	41.81186184279609