Year	% net
1979	84.07459
1993	87.91142
1994	90.87542
1995	91.67187
1996	92.07684
1998	91.38503
2000	84.72127
2001	86.10395
2002	93.42466
2003	95.14437
2004	95.34027
2005	95.48517
2013	95.25222
2014	94.46217
2015	94.64716
2016	94.02944
2017	92.02707
2018	92.21011