Year	% net
1988	29.80183
2003	29.27558
2004	26.06751
2005	32.21784
2007	34.0617
2008	33.05935
2009	35.06274
2010	36.14533
2011	50.03
2013	57.39707
2014	64.31308
2015	68.83567