Year	% net
1999	55.6207
2000	56.48734
2002	60.30395
2003	63.03906
2004	64.88437
2005	66.17629
2006	66.99611
2007	67.66535
2008	68.04242
2009	67.98211
2010	68.55751
2011	69.27626
2012	70.70398
2013	74.46837
2014	76.69764
2015	79.07405
2016	80.15272
2017	79.84907