Year	% net
1992	87.99338
1993	88.47513
1999	71.06988
2004	79.01166
2005	82.03181
2006	82.87592
2007	83.87675
2008	82.8353
2009	80.16377
2010	77.38095
2011	73.14867
2012	72.91495
2013	65.88574
2014	71.18077
2015	57.82323
2016	65.25551
2017	63.82813
2018	59.92424