1926	11.620%
1927	37.490%
1928	43.610%
1929	-8.420%
1930	-24.900%
1931	-43.340%
1932	-8.190%
1933	53.990%
1934	-1.440%
1935	47.670%
1936	33.920%
1937	-35.030%
1938	31.120%
1939	-0.410%
1940	-9.780%
1941	-11.590%
1942	20.340%
1943	25.900%
1944	19.750%
1945	36.440%
1946	-8.070%
1947	5.710%
1948	5.500%
1949	18.790%
1950	31.710%
1951	24.020%
1952	18.370%
1953	-0.990%
1954	52.620%
1955	31.560%
1956	6.560%
1957	-10.780%
1958	43.360%
1959	11.960%
1960	0.470%
1961	26.890%
1962	-8.730%
1963	22.800%
1964	16.480%
1965	12.450%
1966	-10.060%
1967	23.980%
1968	11.060%
1969	-8.500%
1970	4.010%
1971	14.310%
1972	18.980%
1973	-14.660%
1974	-26.470%
1975	37.200%
1976	23.840%
1977	-7.180%
1978	6.560%
1979	18.440%
1980	32.420%
1981	-4.910%
1982	21.410%
1983	22.510%
1984	6.270%
1985	32.160%
1986	18.470%
1987	5.230%
1988	16.810%
1989	31.490%
1990	-3.170%
1991	30.590%
1992	7.770%
1993	10.080%
1994	1.310%
1995	37.590%
1996	22.960%
1997	33.360%
1998	28.580%
1999	21.040%
2000	-9.100%
2001	-11.890%
2002	-22.100%
2003	28.690%
2004	10.880%
2005	4.890%
2006	15.800%
2007	5.490%
2008	-37.000%
2009	23.450%
2010	12.870%
2011	0.006%