Year	Percent
1978	11.11456
1979	20.24269
1980	16.76784
1981	-0.03524
1982	4.48919
1983	8.02075
1984	6.62821
1985	8.33263
1986	6.16817
1987	4.85273
1988	4.815
1989	6.94269
1990	3.02818
1991	7.83089
1992	4.14272
1993	2.78789
1994	5.98764
1995	1.96759
1996	2.82178
1997	2.42201
1998	0.16435
1999	2.89542
2000	24.96793
2001	1.68467
2002	0.17555
2003	-3.72988
2004	3.67992
2005	-1.08706
2006	2.4
2007	1.52517
2008	1.50854
2009	8.00385
2010	0.2967
2011	1.69311
2012	-1.9467
2013	3.91979
2014	-0.10282
2015	4.84969
2016	5.87566
2017	0.99782