Year	% net
1999	53.40962
2000	57.04507
2001	58.44096
2003	66.81806
2005	63.69728
2006	62.55181
2007	61.91411
2008	60.73391
2009	61.14248
2010	61.04829
2011	63.08268
2012	66.08784
2013	67.19701
2014	67.17583
2015	67.77098
2016	70.51574
2017	68.01361
2018	68.98259