Year	% net
1999	88.36962
2000	88.09124
2001	85.44891
2002	85.26602
2003	84.41444
2004	82.16265
2005	79.69969
2006	80.21203
2007	79.59043
2008	83.73253
2009	85.43541
2010	87.00422
2011	87.75251
2012	91.72588
2013	92.37629
2014	93.53142
2015	93.22201
2016	93.8445
2017	95.26274
2018	94.84281