Year	% net
1970	67.66915
1991	87.11419
1994	89.11627
1995	89.7386
1998	85.72662
1999	87.08276
2000	85.94651
2001	86.85367
2002	87.57863
2003	89.12303
2004	89.06283
2005	88.64586
2015	84.35479
2017	87.01258