Year	% net
1974	76.44057
1994	88.84879
1995	88.32253
1997	88.31335
1999	90.82062
2006	96.19792
2007	97.09485
2008	96.59313
2009	94.51121
2010	95.38382
2011	94.58218
2012	91.97876
2013	92.52282
2014	93.99166
2015	94.15426
2016	93.65463
2017	87.18836