Year	% net
1998	80.59882
1999	81.33059
2000	82.86924
2001	84.7552
2002	84.79721
2003	85.10794
2004	83.36971
2005	82.57214
2006	82.96487
2007	83.67544
2008	83.56387
2009	83.25003
2010	85.0625
2011	86.55496
2012	86.84366
2013	88.79285
2014	89.26071
2015	89.48397
2016	88.7039
2017	89.29504
2018	88.81475