Year	% net
1998	18.18514
1999	18.41375
2000	18.9741
2001	19.70322
2002	20.4707
2003	21.2874
2004	22.38181
2005	23.1918
2006	23.88964
2007	24.6815
2008	26.39904
2009	27.77916
2010	29.46706
2011	29.9541
2012	30.45422
2013	31.46142
2014	32.11148
2015	32.91653
2016	33.29172
2017	33.6509
2018	33.98075