Year	% net
1998	83.75907
1999	83.95348
2000	85.07887
2001	85.7722
2002	88.4054
2003	89.4797
2004	91.47287
2005	93.41205
2006	93.78821
2007	92.89928
2008	91.89447
2009	91.23404
2010	90.93238
2011	91.33162
2012	91.28602
2013	92.09885
2014	92.68432
2015	93.82438
2016	94.2014
2017	94.36474