Year	% net
1999	40.01806
2000	41.15796
2001	41.6674
2002	42.80613
2003	44.34872
2004	45.50777
2005	46.39556
2006	47.49076
2007	49.41777
2008	50.65561
2009	50.61451
2010	52.42785
2011	54.13049
2012	55.38944
2013	56.91442
2014	57.27701
2015	57.60987
2016	58.26122
2017	59.56994
2018	59.91367