Year	% net
1981	97.10455
1982	97.81398
1990	95.91662
2000	87.15985
2001	87.40533
2004	92.37668
2005	90.16768
2006	92.50739
2007	91.79998
2016	93.97092
2017	95.17437
2018	96.08382