Year	% net
1999	68.40484
2000	69.52071
2001	67.54648
2002	67.64304
2003	70.63699
2004	61.4782
2005	74.43026
2006	76.11239
2007	82.3406
2008	82.41359
2009	84.75252
2010	82.96418
2011	82.5895
2012	82.16025
2013	80.5875
2015	79.99464
2016	80.2935
2017	81.87527
2018	81.71289