Year	Percent
1960	-0.28797
1961	0.01135
1962	0.79817
1963	0.38964
1964	0.25407
1965	1.07759
1966	0.99047
1967	2.72166
1968	1.31252
1969	3.25843
1970	3.90751
1971	3.40709
1972	2.6796
1973	1.75416
1974	0.89649
1975	0.53561
1976	0.43947
1977	0.52776
1978	0.23296
1979	0.14098
1980	0.2593
1981	0.34467
1982	0.27653
1983	0.17577
1984	0.43527
1985	0.29759
1986	0.434
1987	0.30709
1988	0.26061
1989	0.9158
1990	-0.0135
1991	0.05029
1992	0.1077
1993	0.10485
1994	0.06952
1995	0.056