Year	% net
1971	87.22309
1972	88.33775
1974	91.39207
1976	87.5927
1977	92.16822
1979	89.32676
1982	89.34636
1991	91.24584
1992	88.83853
1993	87.52443
1995	89.20844
1996	87.83213
2003	90.678
2008	92.42376
2009	87.11118
2010	90.35653