Year	% net
1999	80.80743
2000	82.4234
2001	84.3954
2002	84.3447
2003	84.61855
2004	82.88759
2005	81.7847
2006	82.2127
2007	83.01394
2008	82.95586
2009	82.68733
2010	84.72222
2011	86.38006
2012	86.6738
2013	88.65188
2014	89.11743
2015	89.29321
2016	88.4149
2017	89.01519
2018	88.51419