Year	% net
1998	55.11626
1999	55.41705
2000	56.35936
2001	56.72421
2002	56.96275
2003	57.52805
2004	58.31451
2005	58.81936
2006	59.39323
2007	60.58252
2008	61.24246
2009	61.59483
2010	62.97784
2011	64.01206
2012	64.01821
2013	65.83027
2014	66.6904
2015	66.68972
2016	66.92805
2017	67.41774
2018	67.67818