Year	% net
1996	93.93516
1997	95.0039
1998	95.1383
1999	95.59626
2000	95.27463
2001	95.54443
2002	93.96941
2003	94.307
2004	95.46767
2005	94.18482
2006	95.18675
2007	97.78147
2008	98.04598
2009	97.74258
2010	97.95684
2011	97.97584
2012	95.726
2013	93.90701
2014	92.61403
2015	90.40649
2016	87.58166
2017	86.4454