Year	Percent
1965	-6.15851
1966	-3.11188
1967	-0.07794
1968	-0.65523
1969	-3.20601
1970	-3.39872
1971	-3.72567
1972	-2.25673
1973	-3.76166
1974	-5.09838
1975	-4.46563
1976	-3.40347
1977	-2.52894
1978	-4.90067
1979	-4.18186
1980	-7.19027
1981	-6.71623
1982	-7.2157
1983	-11.08412
1984	-8.79665
1985	-8.47036
1986	-8.64044
1987	-9.09334
1988	-10.9347
1989	-11.21572
1990	-11.13414
1991	-11.69355
1992	-9.77596
1993	-10.32365
1994	-12.4442
1995	-9.5442
1996	-12.82262
1997	-11.37986
1998	-11.0655
1999	-6.87004
2000	-9.14258
2001	-10.67836
2002	-10.75646
2003	-12.84815
2004	-12.7819
2005	-14.89557
2006	-17.86881
2007	-18.86795
2008	-20.48457
2009	-22.24074
2010	-26.81983
2011	-24.02019
2012	-23.51042
2013	-26.76785
2014	-29.24502
2015	-29.85139
2016	-29.89074
2017	-32.25833