Year	% of GDP
1973	9.424797533661716
1974	7.612796448262996
1975	7.922647630253886
1976	8.805191867810642
1977	10.456479203377942
1978	10.009433804883116
1979	10.211416742034356
1980	9.611748954357749
1981	9.927705223880597
1982	9.831022454875606
1983	9.236698188688905
1984	8.584435744077668
1985	8.255193264478152
1986	7.411736702422759
1987	6.365541807450603
1988	4.493526714734418
1989	4.2617873765400685
1990	6.197784145729867
1991	5.6102062928527685
1992	5.037396544513576
1993	4.7280103529994255
1994	4.251713450461859
1995	3.744487200051593
1996	3.9593171544735974
1997	4.415239180747989
1998	3.519309518839888
1999	2.752748456846488
2000	2.9665074581845143
2001	2.257140411019706
2002	2.0010471703619035
2003	2.210411864205453
2004	3.2724566560910793
2005	3.8817783564094093
2012	4.52409369741194
2013	5.529567588745056
2014	5.840928925096832
2015	6.0112850397922655
2016	7.17585983640205
2017	6.077742328965786
2018	2.756971252727656
2019	6.017652477264844