Year	% net
1976	93.43276
1977	94.54825
1979	90.23237
1980	87.07084
1981	88.95975
1982	88.29276
2001	91.51107
2002	95.67691
2003	89.20918
2004	85.70602
2005	84.62458
2006	82.8857
2007	83.13332
2008	83.89169
2009	88.12001