Year	% net
1999	88.90513
2000	88.73173
2002	88.96933
2003	89.01378
2004	89.32327
2005	89.64801
2006	89.35486
2007	88.5386
2008	88.43362
2009	88.21897
2010	86.73783
2011	86.56224
2012	86.05021
2013	86.03004
2014	86.40469
2015	86.43909
2016	87.22264
2017	86.88993