Year	% net
1998	87.78129
1999	88.53961
2000	89.75427
2001	90.90133
2002	92.08213
2003	92.52305
2004	91.96783
2005	91.78178
2006	91.17966
2007	92.73635
2008	92.46387
2009	92.74534
2010	93.42939
2011	93.61172
2012	93.29379
2013	94.4455
2014	94.04876
2015	95.57218
2016	94.63566
2017	94.81207