Year	% net
1998	31.33066
1999	31.02491
2000	31.34842
2001	32.36364
2002	32.91639
2003	33.80242
2004	35.80229
2005	36.32779
2006	38.72718
2007	39.91346
2008	41.03393
2009	41.6885
2010	43.19049
2011	43.20466
2012	43.36142
2013	44.85948
2014	44.95472
2015	43.93154
2016	45.56806
2017	46.39526
2018	46.80114