Year	% net
1999	96.99737
2000	96.53343
2001	96.365
2002	95.50207
2003	94.64122
2004	93.85139
2005	93.25894
2006	93.28241
2007	93.32975
2008	93.38685
2009	94.03242
2010	94.52642
2011	94.67097
2012	95.43669
2013	96.00264
2014	96.01392
2017	95.61223