Year	% net
1998	86.69995
1999	86.01917
2000	84.70038
2001	83.97959
2002	86.79452
2003	89.33811
2004	90.99608
2005	91.62347
2006	91.31714
2007	91.00058
2008	89.85709
2009	87.98982
2010	88.56614
2011	87.2124
2012	87.57962
2013	88.89241
2014	89.8803
2015	90.59733
2016	91.28505
2017	92.39913