Year	% of GDP
1981	45.8516836955996
1982	46.3890830526431
1983	49.9582548756692
1984	56.6624830242749
1985	62.4033832560714
1986	58.8006648906309
1987	57.8738758693003
1988	60.8594578412077
1989	51.7736092763377
1990	53.3099141408181
1991	53.5129121466804
1992	53.8350499706913
1993	57.9381972779389
1994	59.4016692515647
1995	60.4194447771526
1996	63.5726846322794
1997	64.2680522795447
1998	65.9353172320749
1999	63.5082795282387
2000	58.1663513023146
2001	67.1065635058951
2002	68.6971327986302
2003	68.305132357398
2004	65.4150611186638
2005	66.6621333758912
2006	62.8449738770373
2007	69.6618492673379
2008	68.7029763211508
2009	71.4038873593072
2010	71.1076912622078
2011	71.5229019048837
2012	69.1527392536606
2013	74.7817454777138
2014	74.4821997960054
2015	77.2309403316661
2016	78.4753435763699
2017	77.7042845819032