Year	% net
1990	49.80246
1992	57.96687
1999	68.26462
2000	71.89039
2001	74.64973
2002	72.40363
2003	70.86169
2004	69.29429
2005	68.42639
2006	67.8951
2007	68.12021
2008	68.34771
2009	70.65692
2010	72.59098
2011	74.90167
2012	75.96144
2013	76.66443
2014	77.14902
2015	79.37816
2016	83.97504
2017	86.30034
2018	88.4108