Year	% net
1998	91.52067
1999	91.29531
2000	90.23202
2001	89.27205
2002	88.73456
2003	87.65259
2004	87.66253
2005	87.6979
2006	86.83579
2007	85.95701
2008	85.01817
2009	85.18012
2010	85.3765
2012	84.49155
2013	88.62747
2014	89.23011
2015	91.7157
2017	94.8883