Year	Percent
1961	7.35017
1962	20.60015
1963	-11.54166
1964	5.78982
1965	-0.99059
1966	-10.65397
1967	4.72251
1968	0.31884
1969	14.83698
1970	-7.01132
1971	6.2306
1972	20.81198
1973	-11.63415
1974	19.94614
1975	15.5191
1976	7.27544
1977	-4.53153
1978	5.12995
1979	0.15693
1980	8.15775
1981	5.69592
1982	-1.47042
1983	-2.12861
1984	-7.3728
1985	2.57164
1986	-8.0177
1987	-1.291
1988	9.80406
1989	-11.68163
1990	4.47778
1991	4.79397
1992	10.27055
1993	2.25503
1994	4.67772
1995	2.83235
1996	1.50053
1997	-1.03163
1998	3.44234
1999	-6.04599
2000	0.27142
2001	2.96696
2002	3.91063
2003	-1.29104
2004	4.55045
2005	3.36732
2006	1.55625
2007	1.83532