Year	Percent of GDP (Units)
1980	21.088
1981	19.687
1982	15.421
1983	20.126
1984	22.188
1985	17.397
1986	20.876
1987	23.773
1988	24.518
1989	24.199
1990	24.892
1991	26.615
1992	23.124
1993	23.395
1994	22.129
1995	20.694
1996	21.299
1997	23.440
1998	24.547
1999	25.246
2000	22.559
2001	22.211
2002	20.428
2003	21.309
2004	21.306
2005	21.510
2006	19.004
2007	19.513
2008	20.580
2009	16.183
2010	18.083
2011	19.269
2012	18.752
2013	18.145
2014	19.094
2015	18.958
2016	17.932
2017	18.890
2018	17.045
2019	18.693
2020	17.345
2021	18.840
2022	17.746
2023	17.950
2024	17.624
2025	17.750
2026	17.692
2027	17.695
2028	17.700
2029	17.708