Year	% net
1996	80.0534
1997	80.73385
1998	80.46368
1999	81.6541
2000	82.9502
2001	84.41814
2002	85.65427
2003	86.17572
2004	85.65713
2005	86.87637
2006	87.05253
2007	87.39711
2008	87.96018
2009	87.8652
2010	88.02388
2011	88.04366
2012	88.04705
2013	89.27365
2014	89.16533
2015	89.41846
2016	89.30462
2017	89.45972
2018	89.42803