Year	% net
1998	93.56284
1999	92.84634
2000	92.87232
2001	93.68062
2002	92.96308
2003	92.80361
2004	92.59098
2005	92.23515
2006	92.33927
2007	92.79725
2008	92.25149
2009	92.67095
2010	92.95217
2011	92.8682
2012	92.91699
2013	92.64227
2014	92.28672
2015	91.87042
2016	91.2322
2017	91.3002