Year	% net
1999	86.86843
2000	86.46473
2001	82.93565
2002	84.71067
2003	84.99832
2004	86.23536
2005	87.00548
2006	88.30855
2007	88.72921
2008	88.31105
2009	88.027
2010	88.84321
2011	88.51651
2012	88.29428
2013	87.93699
2014	87.89669
2015	89.23147
2016	90.41737
2017	90.14286