Year	% net
1999	85.169
2000	86.75838
2001	88.25124
2002	90.55396
2003	91.21779
2004	92.39098
2005	92.36553
2006	93.35992
2007	92.96982
2008	95.20962
2009	95.03722
2010	96.34992
2011	94.32707
2012	93.97184
2013	95.33671
2014	95.40623
2015	95.55489
2016	95.07944
2017	94.66346