Year	% net
1978	22.03288
1979	24.83532
1998	53.68199
1999	54.56965
2000	57.27957
2001	59.90765
2005	69.57875
2006	73.53461
2008	79.444
2009	84.17788
2010	86.28016
2011	87.89042
2012	90.24338
2013	88.33726
2015	88.17317
2016	87.5304
2017	87.42576
2018	88.02597