Year	% of GDP
1997	71.18240932997186
1998	71.85267299528753
1999	72.03464386680801
2000	72.04936838617311
2001	73.27900908479552
2002	74.10268388495334
2003	73.76688719258891
2004	73.26180630332118
2005	73.04516962343051
2006	72.74913365295596
2007	72.92804684315163
2008	73.49188678750185
2009	75.68177887211212
2010	75.25942933434467
2011	74.76210277760008
2012	75.0570190146275
2013	74.61960137486831
2014	74.59225878990168
2015	75.63949810219451
2016	76.31371663367692
2017	75.78012853279185
2018	75.55598734933422
2019	76.0066997134499
2020	76.63100662498576
2021	75.6189409708675