Year	% net
1999	26.10326
2000	25.9745
2001	24.5936
2002	23.65537
2004	22.06605
2005	21.67129
2006	23.5991
2007	23.63527
2008	25.88
2009	26.67388
2010	28.37883
2011	29.23264
2012	29.2454
2013	31.64016
2014	33.05665
2015	33.95577
2016	32.20138
2018	34.76096