Year	% net
1997	93.6832
1999	95.56774
2000	96.65151
2001	96.92281
2002	97.14036
2004	98.78049
2005	97.25467
2006	97.27222
2007	96.66438
2008	96.86625
2015	96.13286
2016	96.25735
2017	95.4151