Year	% net
1998	52.22739
1999	52.49164
2000	53.43284
2001	53.81284
2002	54.11444
2003	54.69496
2004	55.47441
2005	55.96769
2006	56.54525
2007	57.59718
2008	58.25852
2009	58.55034
2010	59.78007
2011	60.69757
2012	60.69908
2013	62.02469
2014	62.76624
2015	62.76488
2016	62.83675
2017	63.21283
2018	63.38137