Year	% net
1977	79.95051
1993	96.34577
1994	98.48619
1995	99.52981
1996	98.47056
1999	94.74303
2000	94.3426
2001	95.29059
2002	95.60755
2003	96.87225
2004	98.10025
2005	98.22814
2006	98.36325
2007	96.83959
2008	95.14791
2009	93.96336
2010	93.18099
2011	93.01853
2012	93.50603
2013	94.09263
2014	94.22357
2015	94.08609
2016	94.33716
2017	95.08123