Year	% net
1999	88.31615
2000	87.94008
2001	85.8418
2002	85.36185
2003	84.36716
2004	82.06094
2005	79.30366
2006	80.29072
2007	79.77919
2008	83.73901
2009	85.14359
2010	85.98262
2011	87.31467
2012	91.23597
2013	93.02524
2014	93.72411
2015	93.74253
2016	94.27911
2017	95.16621
2018	95.04651