Year	% net
1970	68.24207
1991	88.97419
1994	90.19036
1995	90.84667
1998	86.68132
1999	87.95669
2000	86.27335
2001	87.54993
2002	88.31722
2003	89.6519
2004	89.26884
2005	88.85118
2017	86.70383