Year	% net
1998	46.12997
1999	47.17097
2000	47.76897
2001	48.55978
2002	49.94952
2003	49.94144
2004	50.72485
2005	53.08892
2006	54.49689
2007	56.01364
2009	69.16066
2010	71.80644
2011	72.8084
2012	76.17987
2013	80.13801
2014	83.36107
2015	84.72536
2016	85.92267
2017	85.3386
2018	84.67039