Year	% net
1989	94.73198
2000	91.79287
2001	90.85464
2002	88.97418
2003	88.28813
2004	88.85032
2005	88.85073
2006	88.85265
2007	88.66398
2008	88.07856
2009	87.99978
2010	87.91347
2011	87.84316
2012	88.96676
2013	88.93992
2014	89.46177
2015	89.40543
2016	89.691