Year	% net
1981	42.97275
1982	42.57578
1998	63.5868
1999	66.35529
2000	68.85536
2001	70.9076
2002	72.96708
2004	78.99226
2015	82.97556
2016	81.95083
2017	81.50882
2018	81.66395