year Engel.s.coefficient
 1947                63.0
 1948                60.4
 1949                60.1
 1950                57.4
 1951                54.2
 1952                51.0
 1953                48.5
 1954                48.5
 1955                46.9
 1956                45.0
 1957                44.4
 1958                43.8
 1959                42.4
 1960                41.6
 1961                40.3
 1962                39.0
 1963                38.7
 1964                38.1
 1965                38.1
 1966                37.3
 1967                36.8
 1968                35.5
 1969                34.6
 1970                34.1
 1971                33.3
 1972                32.7
 1973                31.9
 1974                32.6
 1975                32.0
 1976                31.6
 1977                30.8
 1978                30.2
 1979                29.2
 1980                29.0
 1981                28.8
 1982                28.2
 1983                27.8
 1984                27.4
 1985                27.0
 1986                26.8
 1987                26.1
 1988                25.5
 1989                25.3
 1990                25.4
 1991                25.1