Year	% net
1999	79.97245
2000	81.64213
2001	83.45605
2002	83.40459
2003	83.68168
2004	81.99364
2005	80.63589
2006	81.34277
2007	82.16796
2008	82.26676
2009	82.06513
2010	84.09228
2011	85.73788
2012	86.24599
2013	88.22682
2014	88.81447
2015	89.01455
2016	88.20588
2017	88.63549
2018	88.08639