1984	81.4	18.6
1985	78.5	21.5
1986	77.1	22.9
1987	73.0	27.0
1988	70.1	29.9
1989	68.0	32.0
1990	67.1	32.9
1991	65.1	34.9
1992	65.2	34.8
1993	63.6	36.4
1994	59.6	40.4
1995	57.2	42.8