Year	% net
1998	19.71796
1999	20.00473
2000	20.70502
2001	21.53815
2002	22.50571
2003	23.41232
2004	24.61484
2005	25.52428
2006	26.34918
2007	27.27619
2008	28.91533
2009	30.20465
2010	31.71098
2011	32.06327
2012	32.45388
2013	33.38542
2014	34.02342
2015	34.8044
2016	35.0705
2017	35.29055
2018	35.58426