Year	% net
1999	55.27524
2000	58.59082
2001	60.15394
2003	68.07142
2005	65.00642
2006	64.72732
2007	64.16498
2008	63.37331
2009	63.70928
2010	63.64555
2011	65.33882
2012	67.45447
2013	69.13129
2014	69.22614
2015	69.39745
2016	72.08962
2017	70.34414
2018	71.149