Year	Percent
1969	0.57477
1970	4.35297
1971	10.65003
1972	-3.38209
1973	8.75411
1974	88.33255
1975	3.88439
1976	12.58586
1977	9.65042
1978	2.32695
1979	31.66701
1980	13.20175
1981	-27.52259
1982	8.33422
1983	14.1917
1984	17.02935
1985	1.68905
1986	-6.73152
1987	9.89416
1988	10.43125
1989	8.40159
1990	73.64539
1991	111.12642
1992	104.50077
1993	114.46767
1994	396.43802
1995	295.36767
1996	-12.54414
1997	91.4988
1998	-15.86077
1999	71.14804
2000	43.67814
2001	-19.57653
2002	6.65337
2003	7.80423
2004	16.7217
2005	32.30692
2006	18.00503
2007	15.01581
2008	30.17541
2009	-19.5212
2010	16.58674
2011	24.68944
2012	2.66977
2013	0.01951
2014	-0.69513
2015	-26.86571
2016	-12.91721
2017	16.2