Year	% net
1999	58.89816
2000	65.04342
2001	65.89208
2002	68.39591
2004	71.82291
2005	71.8415
2006	72.29838
2007	74.18991
2008	76.65399
2009	77.56467
2010	77.95213
2011	78.77399