Year	% of GDP
1972	23.834107726725176
1973	16.18599175985874
1974	20.23417327041225
1975	19.12526861332322
1976	23.053803216963374
1977	23.588482962420564
1978	23.339791250367696
1979	21.499951144549954
1980	22.25716888638237
1981	24.379444518985643
1982	21.52069061244905
1983	22.838165284073092
1984	20.426712308554904
1985	22.775721161881204
1986	24.664523178755886
1987	23.73351822294124
1988	22.65148095962421
1989	21.975963408494817
1990	23.84410132520053
1991	25.42205565891067
1992	26.68790266586117
1993	30.02631619806524
1994	29.8830129792049
1995	27.581425050850317
1996	27.692547493391544
1997	26.396896152728672
1998	26.47806608788521
1999	24.12256312063973
2000	24.68058691384433
2001	24.849316821654778
2002	24.774447932507645
2003	24.868550090881616
2004	25.60485367149058
2005	26.33782781692059
2006	27.136330095372113
2007	26.076009356107914
2008	25.86917617364391
2009	28.292030696361476
2010	28.722294982602353
2011	28.603990018109837
2012	28.302132654787165
2013	29.177660149014468
2014	28.71363197241209
2015	28.12362127985371
2016	33.11004290428535
2017	29.707488204217746
2018	31.353465659222728
2019	30.639627866407704
2020	30.785504040817663