Year	% net
1998	94.995
1999	95.21247
2000	95.59408
2001	95.6725
2002	95.3632
2003	95.39212
2004	95.2882
2005	95.6621
2006	96.12148
2007	95.75565
2008	95.10085
2009	95.73237
2010	96.32562
2011	96.76184
2012	97.34555
2013	97.93533
2014	98.15362
2015	98.16962
2016	98.28579
2017	98.17529