Year	% of GDP
1971	6.15196990966797
1972	5.54999017715454
1973	5.269700050354
1974	4.4931001663208
1975	4.42221021652222
1976	3.83189010620117
1977	3.89760994911194
1978	3.34882998466492
1979	3.15364003181458
1981	2.86532998085022
1982	2.85407996177673
1983	3.31469011306763
1984	3.07872009277344
1985	3.24833989143372
1986	3.10572004318237
1987	3.16531991958618
1988	3.33823990821838
1989	3.58874011039734
1990	3.83141994476318
1991	3.92030000686646
1992	4.31409978866577
1998	4.24004983901978
2002	3.94616007804871
2004	4.42151021957397
2005	5.38576030731201
2006	5.44513845443726
2007	5.94747018814087
2008	5.50122976303101
2009	5.07042980194092
2010	6.25005006790161
2011	7.69612979888916
2012	6.34542989730835
2013	7.57927989959717
2014	7.00420999526978
2015	5.02398014068604
2016	5.10766983032227
2017	4.55917978286743
2018	4.92361116409302
2019	4.93738985061646
2020	5.6448712348938
2021	5.40380144119263