Year	% net
1999	61.97265
2000	70.18143
2001	72.13134
2002	75.00605
2004	78.10509
2005	78.1815
2006	78.81148
2007	80.24331
2008	81.59779
2009	81.79476
2010	82.50797
2011	83.21746