Year	% net
1998	68.54593
1999	69.50003
2000	69.96523
2001	70.37404
2002	70.31763
2003	70.78396
2004	71.96668
2005	73.46097
2006	74.29442
2007	75.59074
2008	76.57893
2009	78.65586
2010	80.50969
2011	81.4094
2012	80.85633
2013	82.57053
2014	85.13286
2015	84.67427
2016	84.80509
2017	84.22266
2018	84.63669