Year	% net
1993	75.42095
1994	83.35864
1995	88.25397
1996	89.609
1997	89.62818
1998	89.08227
1999	86.68436
2000	86.69312
2001	90.88313
2002	90.55197
2003	94.07476
2004	95.61926
2005	95.07328
2006	93.72721
2007	93.68707
2008	90.02463
2009	90.98564
2010	91.31441
2011	91.10005
2012	89.75932
2015	86.27801
2016	84.10588
2017	82.22835