Year	% net
1996	92.71352
1997	94.18397
1998	93.66937
1999	94.57701
2000	94.33859
2001	94.62258
2002	93.50685
2003	94.06808
2004	95.32423
2005	94.00328
2006	94.80095
2012	95.61473
2013	93.79741
2014	92.67867
2015	90.18857
2016	87.26579
2017	86.31274