Year	% net
1977	88.56238
1978	88.96851
1979	79.53812
1980	79.28354
1981	76.56047
1982	75.02992
1983	76.39527
1984	77.27961
1986	80.16044
1991	89.07874
1992	91.82186
1993	95.46467
1994	95.21316
1995	98.14344