Year	% net
1990	44.88743
1992	54.68931
1999	62.41335
2000	66.0109
2001	67.75308
2002	68.31494
2003	69.25057
2004	70.13279
2005	70.22933
2006	69.94703
2007	69.22445
2008	68.51573
2009	69.16717
2010	72.25076
2011	74.60939
2012	74.18151
2013	74.08331
2014	74.98871
2015	76.21194
2016	79.58574
2017	82.58633
2018	84.55769