Year	% of GDP
1977	28.635645076498687
1978	25.22153157547364
1979	27.067320280396267
1980	26.004068119818992
1989	21.835994876618543
1990	26.230986482090298
1995	27.67739877989398
1996	29.088897217275193
1997	26.6948883109585
1998	25.00783142388865
1999	28.27479217160184
2000	28.86467684201414
2005	34.74748056531282
2006	35.62995763467931
2007	35.33787234695045
2008	37.69153332806781
2009	27.237084999599553
2010	30.180568156174242
2011	28.97114393476219
2012	27.802945464951545
2013	27.01737304712339
2014	24.244744529733563
2015	19.625271937525625
2016	19.408660415489244
2017	23.217002045406804
2018	26.416344576027235
2019	25.023998836034288
2020	19.849386325501925
2021	24.742282068891225