an	haut	bas

1962	25.82	18.24

1963	25.35	16.5

1964	24.29	20.26

1965	24.05	20.97

1966	24.89	19.43

1967	25.35	19.31

1968	25.23	20.85

1969	25.06	19.54

1970	27.13	20.49

1971	27.36	21.91

1972	26.65	22.51

1973	27.13	18.81

1974	27.49	19.42

1975	27.08	19.1

1976	27.51	18.8

1977	27.54	18.8

1978	26.21	17.57