Year	% net
1970	34.56778
1973	50.74888
1977	54.57236
1978	53.73746
1981	55.53359
1983	49.21855
1984	52.90903
1985	51.44759
1986	51.01904
1987	50.24342
1988	64.54924
1989	64.80315
1990	68.95354
2008	93.66587