Year	Percent
1961	-0.56543
1962	-2.74775
1963	22.50119
1964	2.11543
1965	-2.95205
1966	7.59091
1967	0.93773
1968	4.3236
1969	-3.17531
1970	3.00423
1971	7.20757
1972	-7.89006
1973	16.84409
1974	29.45063
1975	8.75629
1976	8.18303
1977	10.66335
1978	10.27801
1979	16.1133
1980	17.47229
1981	17.15638
1982	2.40428
1983	5.04453
1984	7.16238
1985	4.09733
1986	26.32328
1987	25.40542
1988	28.61461
1989	23.32706
1990	19.33487
1991	7.61052
1992	5.11899
1993	5.85308
1994	13.62347
1995	6.68404
1996	15.89657
1997	6.01124
1998	-0.2994
1999	7.44243
2000	9.70099
2001	4.56357
2002	-1.30518
2003	0.59745
2004	10.32934
2005	11.96643
2006	7.78975
2007	11.96717