Year	% net
2001	88.10281
2002	85.33072
2003	83.61607
2004	82.27864
2005	83.00852
2006	85.18724
2007	86.94492
2008	87.14783
2009	85.7367
2010	84.07748
2011	83.26437
2012	84.21212
2013	84.54456
2014	83.89503
2015	82.57315
2016	82.18406
2017	83.09318