| | | | | | | | | 1951 | | | | | | | | | | | 1959 6 22 | | | 5% | 3% 5% | | 6% 8% | | | | | | 1960 4 17 1960 | | 372.1 294.7 | 77.4 | | 1961 4 3 | | | | | | | | 1966 1976 | | 1980 | 1980 1979 71.4 9.74% | 1981 1980 66 8.72% 1985 1990 | | | | | | | | | | | |