Year	% of GDP
1972	13.680949922560663
1973	10.447321954090642
1974	12.710355266672602
1975	12.23612691189483
1976	15.523334544373618
1977	15.847694761892308
1978	16.023072683687168
1979	14.447000719507539
1980	15.825777623530431
1981	16.739064806118343
1982	14.005553777347163
1983	15.121297642464151
1984	13.869256647091804
1985	15.949752648995554
1986	16.76322843868655
1987	15.965446347106166
1988	15.189103076773128
1989	14.53217809458096
1990	16.202586399924154
1991	16.79324031608974
1992	17.24085747440589
1993	19.389494107735025
1994	19.03440938350433
1995	16.878758028336772
1996	17.351102234929826
1997	16.780792455572044
1998	16.98284177456355
1999	15.278285168979044
2000	14.69913703865792
2001	15.305981583974926
2002	15.777676218729505
2003	17.206005898569114
2004	17.84620461742374
2005	17.89692196657381
2006	18.832306418653793
2007	18.110942594677205
2008	17.800201322152777
2009	18.12269904716162
2010	18.136419018586157
2011	18.198773485893796
2012	17.791874450605764
2013	17.859739726467346
2014	17.27528938008397
2015	17.095615857288312
2016	21.732247876125413
2017	18.077462198057304
2018	18.32475141355619
2019	17.86507307179329
2020	18.51487175337592