Year	% net
1978	3.57778
1979	5.28208
1981	10.13505
1982	12.05678
1993	49.31918
1999	63.41522
2000	67.56254
2001	71.17022
2002	73.07951
2003	73.871
2009	89.281
2011	89.67208
2012	88.88807
2013	90.58011
2015	93.48381
2016	95.46011
2017	94.0779
2018	96.19256