Year	% net
1990	90.59976
1992	85.30534
1999	87.72635
2000	86.58564
2001	84.29258
2002	84.30564
2003	84.51812
2004	84.48357
2005	84.73282
2006	85.29845
2007	86.02394
2008	85.93676
2009	84.96542
2010	84.70891
2011	85.41529
2012	86.41172
2013	88.04406
2014	91.62031
2015	94.16858
2016	97.01576
2017	96.92808
2018	96.39243