Year	% net
1998	84.93358
1999	81.38731
2000	79.55547
2001	80.07134
2002	83.54017
2003	85.81672
2004	88.42327
2005	89.58415
2006	90.01283
2007	88.78155
2008	88.06405
2009	86.12349
2010	87.23793
2011	86.47609
2012	86.76453
2013	86.07908
2014	87.5502
2015	88.90719
2016	88.74134
2017	90.18292