Year	% net
1973	99.45933
1974	99.14273
1983	98.01424
1991	98.81623
1992	97.34669
1994	97.17952
1995	98.63502
1996	98.88263
2013	98.05794
2014	97.61935
2015	97.96567
2016	98.86377