Year	% net
1998	27.77282
1999	27.51277
2000	27.70499
2001	28.5431
2002	28.96032
2003	29.58017
2004	31.16369
2005	31.45523
2006	32.94708
2007	33.2981
2008	34.75726
2009	36.13247
2010	37.54153
2011	37.31798
2012	37.19538
2013	38.49956
2014	39.5244
2015	39.44573
2016	41.30701
2017	42.05045
2018	42.98152