Year	% net
1998	53.89543
1999	54.10659
2000	54.93954
2001	55.54719
2002	56.06077
2003	56.94918
2004	57.81391
2005	58.49775
2006	59.11553
2007	60.08915
2008	60.84241
2009	61.3097
2010	62.54485
2011	63.53369
2012	63.79482
2013	64.8996
2014	65.64805
2015	65.71337
2016	65.82859
2017	66.19644
2018	66.27183