Year	Percent of GDP (Units)
1980	32.353
1981	28.779
1982	21.054
1983	17.829
1984	27.583
1985	25.860
1986	18.653
1987	25.497
1988	20.139
1989	21.124
1990	25.935
1991	21.264
1992	17.543
1993	15.001
1994	18.511
1995	20.721
1996	29.253
1997	32.029
1998	25.834
1999	28.683
2000	34.250
2001	29.135
2002	29.136
2003	29.313
2004	35.623
2005	40.753
2006	41.745
2007	36.122
2008	37.028
2009	25.957
2010	23.726
2011	28.236
2012	24.497
2013	33.474
2014	22.027
2015	6.635
2016	6.818
2017	12.624