Year	% net
1979	98.70816
1981	99.72842
1983	99.35027
1984	99.42015
1985	98.81427
1986	97.42141
1987	94.38566
1989	98.42166
1991	99.72754
1992	99.93898
1993	98.85377
1994	99.04853
1995	98.29672
1996	98.31647
1997	99.11476
2014	97.4324
2015	95.76556
2016	97.47591
2017	94.69278