Year	% net
1998	81.49898
1999	81.41664
2000	82.4521
2001	83.15338
2002	85.84913
2003	86.50077
2004	89.16866
2005	91.35568
2006	91.90848
2007	90.83368
2008	90.16888
2009	90.11295
2010	90.16334
2011	91.0205
2012	91.11691
2013	91.59592
2014	91.97561
2015	93.14593
2016	93.42454
2017	93.28745