Year	% net
1998	79.18199
1999	80.12551
2000	81.70009
2001	83.26107
2002	83.2657
2003	83.53492
2004	81.9239
2005	80.52076
2006	81.44559
2007	82.21514
2008	82.42758
2009	82.25547
2010	84.06752
2011	85.50571
2012	86.17306
2013	88.08148
2014	88.75577
2015	89.02745
2016	88.36345
2017	88.61093
2018	88.0361