Year	Percent
1971	-0.48808
1972	-0.28146
1973	-0.18725
1974	-0.18003
1975	-0.28761
1976	2.59572
1977	2.55549
1978	2.56799
1979	2.76205
1980	3.0617
1981	3.38393
1982	-2.67015
1983	-0.40049
1984	3.33594
1985	6.05467
1986	2.99114
1987	8.13854
1988	4.53215
1989	3.34433
1990	1.04349
1991	0.53862
1992	2.24193
1993	2.86052
1994	5.2965
1995	4.26852
1996	5.22621
1997	5.49744
1998	6.03935
1999	8.77369
2000	1.84334
2001	-1.86813
2002	-2.00383
2003	-2.8033
2004	2.22013
2005	4.05808
2006	7.89271
2007	2.66193
2008	1.17082
2009	-1.77929