Year	Percent
1966	-6.93365
1967	2.12408
1968	10.81745
1969	10.70936
1970	21.6422
1971	-0.13407
1972	-1.13291
1973	-13.27248
1974	10.55033
1975	5.29382
1976	1.15485
1977	0.4013
1978	8.60219
1979	-14.22383
1980	-1.50232
1981	-8.69506
1982	0.25641
1983	-3.97713
1984	-0.18028
1985	2.60554
1986	-2.8246
1987	3.62552
1988	32.00917
1989	8.83983
1990	1.17457
1991	2.2303
1992	-1.96059
1993	-2.02955
1994	-0.10936
1995	3.57106
1996	-1.45576
1997	0.05531
1998	-5.02094
1999	-0.99761
2000	0.17714