Year	% net
1998	79.90135
1999	80.73788
2000	82.29494
2001	84.02187
2002	84.04544
2003	84.33615
2004	82.66045
2005	81.56678
2006	82.22103
2007	82.961
2008	83.00859
2009	82.76428
2010	84.57692
2011	86.04322
2012	86.51647
2013	88.44553
2014	89.01402
2015	89.26089
2016	88.53747
2017	88.96116
2018	88.43456