Year	% net
1978	13.23909
1979	15.59164
1998	49.98523
1999	51.28878
2000	54.43079
2001	57.37129
2005	69.62885
2006	73.9767
2008	80.56935
2009	85.39927
2010	87.74699
2011	89.24738
2012	91.40577
2013	89.27807
2015	89.14289
2016	88.10899
2017	87.64798
2018	88.54243