Year	% net
1998	47.37853
1999	48.04316
2000	48.64054
2001	49.59329
2002	50.53312
2003	50.8589
2004	51.21197
2005	53.84625
2006	55.28489
2007	56.61446
2009	70.14665
2010	72.48103
2011	73.45156
2012	76.95222
2013	80.98376
2014	84.31903
2015	85.96723
2016	87.17883
2017	86.53268
2018	86.0294