Year	Percent
1971	8.24371
1972	8.24373
1973	8.24371
1974	8.24371
1975	8.2437
1976	2.23043
1977	2.23044
1978	2.23042
1979	2.23044
1980	2.23043
1981	7.01271
1982	7.17686
1983	3.21765
1984	2.95144
1985	2.8552
1986	3.69822
1987	2.51954
1988	2.50531
1989	3.14382
1990	5.40244
1991	5.87013
1992	4.02355
1993	3.30189
1994	0.85236
1995	1.79595
1996	0.81542
1997	0.51471
1998	0.01463
1999	0.81919
2000	1.55252
2001	0.98585
2002	0.65082
2003	0.63256
2004	0.81017
2005	1.19057
2006	1.31488
2007	6.58174
2008	-2.11669
2009	-9.90066