Year	% net
1997	83.10079
1998	84.72523
1999	86.69373
2000	92.40854
2003	97.43006
2006	94.83255
2007	95.88748
2008	94.57758
2010	93.61728
2011	97.51867
2012	97.40673
2014	95.04806
2015	95.26797
2016	92.75899
2017	90.54321
2018	90.26554