Year	% net
1999	39.66008
2000	40.60467
2002	50.94075
2004	50.03848
2005	53.29682
2007	62.2369
2008	60.8427
2009	64.31607
2010	63.72856
2011	63.17685
2012	63.82419
2013	65.55798
2014	66.95176
2015	67.83227
2016	68.88978
2017	70.27235
2018	70.60614