année	km/h
1903	25,678
1904	24,849
1905	27,481
1906	24,463
1907	28,470
1908	28,740
1909	28,658
1910	28,680
1911	27,322
1912	27,894
1913	27,625
1914	27,028
1915
1916
1917
1918
1919	24,056
1920	24,072
1921	24,720
1922	24,488
1923	24,233
1924	23,972
1925	24,775
1926	24,064
1927	26,836
1928	27,886
1929	28,320
1930	27,978
1931	28,735
1932	29,313
1933	29,732
1934	30,360
1935	30,650
1936	31,045
1937	31,768
1938	31,565
1939	31,986
1940
1941
1942
1943
1944
1945
1946
1947	31.412
1948	33.443
1949	32.121
1950	32.718
1951	32.964
1952	31.739
1953	34.596
1954	34.742
1955	34.446
1956	36.268
1957	34.250
1958	36.919
1959	35.374
1959	35.374
1960	37.210
1961	36.033
1962	37.306
1963	37.092
1964	35.420
1965	35.886
1966	36.760
1967	35.018
1968	34.894
1969	35.409
1970	35.589
1971	36.925
1972	35.371
1973	33.918
1974	35.241
1975	34.899
1976	34.514
1977	35.585
1978	34.929
1979	36.513
1980	35.317
1981	37.987
1982	37.470
1983	35.914
1984	34.906
1985	36.215
1986	36.950
1987	36.645
1988	38.909
1989	37.818
1990	37.518
1991	38.747
1992	39.504
1993	38.709
1994	38.383
1995	39.193
1996	39.236
1997	39.238
1998	40.160
1999	40.276
2000	39.556
2001	40.070
2002	39.880
2003	40.956
2004	40.549
2005	41.654
2006	40.784