Year	% net
1981	41.33921
1982	40.12855
1998	65.28922
1999	66.51573
2000	67.60967
2001	69.91733
2002	74.01847
2004	79.77912
2015	87.79956
2016	86.74572
2017	87.69854
2018	87.0561