Year	% net
1998	18.1786
1999	18.4075
2000	18.96811
2001	19.6968
2002	20.46478
2003	21.28134
2004	22.37605
2005	23.18581
2006	23.88451
2007	24.67609
2008	26.39413
2009	27.77462
2010	29.46311
2011	29.95311
2012	30.45178
2013	31.4582
2014	32.10849
2015	32.91337
2016	33.28841
2017	33.6477
2018	33.97774