Year	% net
1985	31.52037
1994	46.50189
1995	52.80779
1996	56.18374
1998	59.85097
1999	59.53931
2000	60.0675
2001	63.82603
2002	63.36953
2003	66.71767
2004	74.01182
2005	72.5486
2006	75.21723
2007	76.04504
2008	72.67765
2009	72.05813
2010	72.37404
2011	72.44657
2012	71.15951
2013	74.54884
2014	76.29421
2016	73.11291
2017	77.82357
2018	79.5744