Year	% of GDP
1973	14.720782607146136
1974	14.779930140334242
1975	14.300318553750717
1976	15.061414183196849
1977	15.24389598964
1978	15.340467460203826
1979	15.3682621085073
1980	15.730309214315074
1981	15.776674980308442
1982	15.889404624246243
1983	16.321479003973344
1984	16.461620704663442
1985	16.672543932630457
1986	17.204053540045642
1987	17.419570554211127
1988	17.545881373037442
1989	17.62686467734068
1990	17.808468865309642
1991	18.409609501448063
1992	18.370748441365258
1993	18.180772786019034
1994	18.249206742744132
1995	19.357766767151908
1996	19.46740662250138
1997	19.817339018222548
1998	20.179811650107812
1999	20.52770987790728
2000	20.31122731620083
2001	19.786413326492834
2002	19.413633206891035
2003	19.263536602608117
2004	19.035106841553855
2005	19.29390937449689
2006	19.62764267538036
2007	19.850195001268197
2008	19.650853461223218
2009	19.072948441977246
2010	19.252630958421214
2011	19.349024544079548
2012	19.059175146496937
2013	19.484113570025958
2014	19.58045914192365
2015	19.480129873407623
2016	19.42860055599752
2017	19.579486678921338
2018	19.664851302001807
2019	19.75244478567594
2020	19.43442197104958
2021	19.863074403989433
2022	19.936236063983362