Year	% net
2001	88.73751
2002	86.22817
2003	84.04108
2004	82.90059
2005	83.6249
2006	85.8734
2007	87.8224
2008	88.16745
2009	86.77788
2010	84.92458
2011	84.14682
2012	85.1221
2013	85.29294
2014	84.75056
2015	83.5919
2016	82.97944
2017	84.10775