Año	Índice 
1900	   12.8
1901	   13.0
1902	   13.6
1903	   14.5
1904	   15.3
1905	   16.2
1906	   16.7
1907	   17.3
1908	   17.8
1909	   18.5
1910	   18.8
1911	   17.8
1912	   14.5
1913	   16.7
1914	   12.5
1915	   15.0
1916	   13.8
1917	   12.5
1918	   11.9
1919	   15.1
1920	   14.6
1921	   14.4
1922	   19.6
1923	   22.2
1924	   23.3
1925	   23.9
1926	   27.1
1927	   24.6
1928	   25.7
1929	   27.3
1930	   28.7
1931	   34.2
1932	   24.8
1933	   22.9
1934	   34.2
1935	   33.3
1936	   38.3
1937	   40.1
1938	   41.3
1939	   43.8
1940	   46.1
1941	   53.1
1942	   60.6
1943	   63.9
1944	   68.8
1945	   75.0
1946	   76.5
1947	   74.4
1948	   80.3
1949	   87.4
1950	   100.0
1951	   111.1
1952	   119.4
1953	   116.9
1954	   125.4
1955	   138.5
1956	   153.6
1957	   171.8
1958	   182.1
1959	   195.9
1960	   213.7
1961	   225.5
1962	   235.7
1963	   258.1
1964	   299.6
1965	   325.5
1966	   355.5
1967	   378.2
1968	   415.2
1969	   451.3
1970	   489.2
1971	   505.0
1972	   548.4
1973	   598.6
1974	   635.5
1975	   661.4
1976	   682.3
1977	   705.9
1978	   771.0
1979	   838.6
1980	   972.5
1981	  1 044.4
1982	  1 002.9
1983	   927.0
1984	   976.1
1985	  1 044.4
1986	  1 008.9
1987	  1 048.2
1988	  1 078.6
1989	  1 147.6
1990	  1 206.1
1991	  1 253.1
1992	  1 281.9
1993	  1 272.2
1994	  1 324.4
1995	  1 258.2
1996	  1 396.6
1997	  1 532.1