Year	% net
1979	40.96322
1993	77.78587
1994	80.43106
1995	81.62202
1996	83.89642
1998	89.16748
1999	64.20613
2000	62.31234
2001	67.73745
2002	67.94511
2003	71.97635
2004	71.07045
2005	78.74649
2007	75.56502
2008	72.16457
2009	72.55927
2010	72.50807
2013	71.66563
2014	73.76007
2015	76.10429
2016	76.66594
2017	75.02705
2018	77.63271