Year	% net
1998	51.54027
1999	51.83273
2000	52.71753
2001	53.60913
2002	54.37
2003	55.55534
2004	56.57707
2005	57.44694
2006	58.15202
2007	59.15708
2008	60.02488
2009	60.71055
2010	62.09554
2011	63.27635
2012	63.8382
2013	64.8316
2014	65.6666
2015	65.76561
2016	65.8486
2017	66.26728
2018	66.26578