Year	% net
1998	61.8741
1999	62.27847
2000	63.15354
2001	63.96046
2002	64.91061
2003	63.43794
2004	64.53033
2005	65.24911
2006	65.48237
2007	65.63432
2008	67.92386
2009	69.17495
2010	69.74443
2011	70.25541
2012	70.31038
2013	73.94153
2014	74.07103
2015	74.80961
2016	75.61582
2017	75.64499
2018	75.79267