Year	% net
1977	94.18554
1978	94.99743
2005	83.17978
2006	85.44387
2007	83.33554
2008	90.07385
2009	93.92212
2010	90.53085
2011	88.84737
2012	89.0237
2013	88.47808
2014	88.71092
2015	89.68686
2016	90.88931
2017	87.98488
2018	87.72937