Year	Percent
1967	2.81303
1968	0.21044
1969	0.17921
1970	0.19841
1971	2.38153
1972	9.00953
1973	17.80234
1974	33.65319
1975	18.76004
1976	18.56511
1977	43.27928
1978	7.65563
1979	25.11102
1980	16.44737
1981	15.12175
1982	6.79552
1983	3.39069
1984	4.02547
1985	2.81143
1986	4.4155
1987	3.06074
1988	0.38367
1989	2.13717
1990	4.72655
1991	0.76841
1992	1.94607
1993	5.91974
1994	7.64427
1995	3.63171
1996	3.96353
1997	3.59272
1998	11.65946
1999	1.56206
2000	2.657
2001	0.2482
2002	2.01069
2003	1.28125
2004	1.45223
2005	0.2859
2006	0.5351
2007	1.49221
2008	0.336
2009	1.05859
2010	-0.16594