Year	% net
1998	56.13721
1999	56.27319
2000	57.05331
2001	57.39193
2002	57.67075
2003	58.27267
2004	58.98751
2005	59.49344
2006	60.02987
2007	60.96726
2008	61.61238
2009	61.87435
2010	62.96926
2011	63.77674
2012	63.75537
2013	64.96435
2014	65.63201
2015	65.66595
2016	65.81118
2017	66.13172
2018	66.2793