Year	Percent
1978	2.36647
1979	1.81663
1980	0.73656
1981	1.41305
1982	3.64118
1983	3.298
1984	0.22812
1985	0.45185
1986	3.23916
1987	2.73649
1988	3.45679
1989	-0.72931
1990	1.23411
1991	-1.01037
1992	2.26987
1993	-2.59705
1994	-2.37669
1995	-6.34268
1996	-8.58943
1997	-5.84394
1998	3.27043
1999	-3.35883
2000	5.48675
2001	-2.00474
2002	0.02186
2003	1.53396
2004	4.04795
2005	3.40498
2006	2.59541
2007	5.71365
2008	4.90157
2009	5.50345
2010	3.63312
2011	4.81056
2012	-1.28628
2013	4.3841
2014	5.76305
2015	6.88884
2016	8.85514
2017	10.24448