Bang 8
Nam	V	H	DH	SG	HN	DN
25 6
1963	28.8	29.6	28.9	27.1	28.6	29.3
1964	29.4	28.9	29.3	27.2	29.1	29.0
1965	29.3	29.6	29.7	27.6	29.0	29.4
1966	29.6	29.5	29.6	27.5	29.2	29.4
1967	30.6	30.3	30.4	27.4	29.6	29.6
1969	29.4	29.9	29.6	28.0	29.2	29.4
1970	29.6	30.6	30.0	27.0	29.0	30.0
1971	28.1	28.8	28.1	27.7	28.3	28.7
1972	29.3	30.3	28.9	27.4	28.3	30.1
1973	29.1	29.6	29.5	27.5	28.8	29.6
1974	30.6	30.2	30.3	27.7	28.8	29.7
1976	29.2	29.4	29.0	27.3	29.3	29.5
1977	30.4	29.8	30.5	27.3	28.9	29.6
1978	28.9	28.4	29.0	27.3	29.1	28.6
1979	30.8	29.8	29.0	27.3	29.8	29.7
1980	30.2	29.6	30.7	27.4	28.8	29.6
1981	28.7	28.4	30.4	27.5	29.0	28.6
1982	30.4	29.6	28.1	26.6	29.4	29.6
1983	30.9	29.7	30.4	27.6	30.4	29.3
1984	30.0	28.8	30.7	27.0	29.6	28.8
1985	29.4	29.3	29.9	27.0	29.1	28.8
1986	30.2	30.1	29.3	27.6	29.1	29.4
1987	30.2	30.3	30.4	27.6	29.5	29.5
1988	30.2	30.2	31.1	27.6	29.5	29.4
1990	29.7	29.4	29.0	27.7	28.7	29.1