Year	% net
1999	79.1101
2000	80.8336
2001	82.48241
2002	82.43028
2003	82.70971
2004	81.06585
2005	79.44146
2006	80.43643
2007	81.28529
2008	81.54612
2009	81.41374
2010	83.4318
2011	85.06366
2012	85.79707
2013	87.78127
2014	88.49721
2015	88.72278
2016	87.98714
2017	88.23702
2018	87.63771