Year	% net
1999	37.94873
2000	39.21835
2001	39.45048
2002	40.80542
2003	42.38781
2004	43.5326
2005	45.2492
2006	46.59837
2007	48.49171
2008	50.24801
2009	49.83545
2010	52.14638
2011	54.02543
2012	55.94732
2013	57.56894
2014	58.0758
2015	58.30514
2016	58.68417
2017	60.20007
2018	60.5279