Year	% net
1979	44.91131
1993	78.8783
1994	82.21917
1995	82.16093
1996	83.60779
1998	89.6984
1999	66.55432
2000	65.33721
2001	71.20647
2002	70.56012
2003	74.80909
2004	74.78367
2005	81.58629
2007	79.14181
2008	76.43478
2009	76.27449
2010	74.66878
2013	73.85355
2014	74.57848
2015	78.19143
2016	80.64695
2017	79.64231
2018	80.06115