Year	% net
1997	76.28283
1998	78.27238
1999	81.32934
2000	87.05899
2006	93.97854
2007	93.97246
2008	92.68506
2010	92.67004
2014	93.98912
2015	96.56381
2016	92.7302
2017	90.32308
2018	90.19264