Year	% net
1993	92.77019
1994	92.37155
1995	91.33603
1996	91.54053
1997	91.0319
1998	91.16269
1999	91.39968
2000	90.6973
2001	91.40362
2002	92.22417
2003	93.82344
2004	93.39085
2005	92.0378
2006	92.201
2007	92.39302
2008	92.60403
2009	92.35056
2010	93.04677
2011	93.24368
2012	93.12342
2013	93.572
2014	93.44499
2015	93.72667
2016	93.84347
2017	92.11119
2018	92.00484