Year	% net
1998	49.58251
1999	49.9311
2000	50.93565
2001	51.61339
2002	52.22729
2003	53.10246
2004	54.02102
2005	54.71912
2006	55.40113
2007	56.49204
2008	57.28407
2009	57.79404
2010	59.20003
2011	60.32994
2012	60.64235
2013	61.86824
2014	62.6777
2015	62.70272
2016	62.78626
2017	63.20392
2018	63.29202