Year	% net
1998	27.12398
1999	29.88415
2000	30.67589
2001	27.60185
2002	26.56347
2004	24.15185
2005	23.44309
2006	24.89945
2007	25.15857
2008	27.30239
2009	27.73351
2010	29.12365
2011	30.06088
2012	30.4559
2013	32.74037
2014	33.54261
2015	34.24597
2016	32.95718
2018	34.23885