Year	Percent
1975	5.58664
1976	4.91792
1977	3.93701
1978	7.01837
1979	4.05683
1980	3.37034
1981	4.04176
1982	3.82169
1983	7.78645
1984	3.06535
1985	3.27283
1986	2.14089
1987	2.04707
1988	0.67747
1989	0.3034
1990	0.75898
1991	0.85823
1992	0.93023
1993	2.51792
1994	1.21694
1995	0.19017
1996	2.00152
1997	1.51639
1998	3.22393
1999	-0.10243
2000	0.32491
2001	0.06704
2002	0.87865
2003	3.62845
2004	4.57289
2005	-0.08719
2006	-0.09921
2007	2.10847
2008	1.05997
2009	1.55208
2010	2.16584