Year	% net
1999	89.06554
2007	89.22317
2008	88.6485
2009	88.92463
2010	88.90289
2011	88.00827
2012	88.24667
2013	87.95611
2014	88.11683
2015	88.69066
2016	88.79724
2017	89.3503