Year	Percent
1976	2.27379
1977	4.40393
1978	-0.13215
1979	0.84225
1980	0.30705
1981	2.4115
1982	0.17741
1983	-0.34626
1984	-0.24007
1985	-1.30133
1986	-0.53387
1987	0.39794
1988	1.30239
1989	0.82952
1990	-0.54643
1991	-0.04179
1992	0.00965
1993	0.87646
1994	0.71801
1995	3.11461
1996	2.43281
1997	3.3163
1998	2.14979
1999	1.94303
2000	3.09851
2001	1.23073
2002	1.72038
2003	2.14428
2004	3.02144
2005	5.72797
2006	6.9476
2007	6.71809
2008	8.17173
2009	6.6516
2010	8.63699
2011	6.61958
2012	4.90808
2013	3.59679
2014	2.29324
2015	0.64513
2016	0.62273
2017	7.62806