Year	% net
1998	46.98367
1999	47.42636
2000	48.48688
2001	49.47115
2002	50.41031
2003	51.57651
2004	52.61699
2005	53.52267
2006	54.30229
2007	55.41123
2008	56.33168
2009	57.06375
2010	58.65158
2011	59.99452
2012	60.63106
2013	61.7544
2014	62.6317
2015	62.68639
2016	62.77908
2017	63.23263
2018	63.23281