Year	% net
1998	23.85018
1999	24.43345
2000	25.31212
2001	26.19728
2002	26.93838
2003	27.87856
2004	28.44141
2005	29.05636
2006	30.19647
2007	30.96664
2008	32.0151
2009	33.35579
2010	34.74546
2011	35.24059
2012	35.96327
2013	36.54295
2014	37.4741
2015	38.34268
2016	39.32804
2017	39.79571
2018	39.52295