"Year","Income","Size"
1971,39.8,3.68
1972,42.1,3.62
1973,43.5,3.6
1974,47.1,3.54
1975,48.3,3.47
1976,48.6,3.42
1977,48.2,3.4
1978,50.2,3.4
1979,50.4,3.38
1980,50.9,3.34
1981,49.2,3.27
1982,49,3.24
1983,48.4,3.21
1984,48.9,3.18
1985,50.2,3.17
1986,50.9,3.18
1987,52.2,3.16
1988,52.8,3.12
1989,54.2,3.1
1990,51.7,3.09
1991,51.1,3.08