Year	% net
1999	33.72671
2000	35.46582
2001	30.67432
2002	29.53776
2004	26.28553
2005	25.254
2006	26.22692
2007	26.71083
2008	28.74861
2009	28.80811
2010	29.879
2011	30.8985
2012	31.67723
2013	33.84789
2014	34.03077
2015	34.53697
2016	33.71403
2018	33.7171