Year	% net
1999	32.80551
2000	33.97282
2001	34.97668
2002	36.88717
2003	38.99922
2004	40.04722
2005	41.93262
2006	43.36306
2007	45.346
2008	47.45936
2009	47.73063
2010	50.50826
2011	52.92137
2012	55.34663
2013	57.33574
2014	57.93256
2015	58.25063
2016	58.6056
2017	60.23083
2018	60.07847