Year	Percent
1974	-7.90956
1975	0.84429
1976	0.90811
1977	1.44817
1978	11.26989
1979	5.89668
1980	3.76052
1981	1.05927
1982	1.96333
1983	0.18849
1984	-1.38368
1985	2.13489
1986	0.57621
1987	0.57246
1988	0.94037
1989	0.67771
1990	1.12007
1991	0.40441
1992	-0.77436
1993	-0.96255
1994	1.56922
1995	1.99854
1996	1.18108
1997	1.40097
1998	1.90014
1999	2.70002
2000	4.07086
2001	5.44566
2002	3.90164
2003	2.72876
2004	4.12087
2005	4.53704
2006	4.14541
2007	2.4698
2008	1.60229
2009	1.45807
2010	3.93774
2011	19.37574
2012	3.14276
2013	4.49768
2014	1.20343
2015	6.30554
2016	-1.05436
2017	3.02523