Year	% net
1998	69.82836
1999	70.8903
2000	71.17507
2001	71.42574
2002	70.89586
2003	70.92777
2004	71.59837
2005	72.55847
2006	73.16285
2007	74.26708
2008	75.0558
2009	77.00594
2010	78.83115
2011	79.65448
2012	78.69464
2013	80.76516
2014	83.14235
2015	82.80978
2016	82.92815
2017	82.44917
2018	82.59895