Year	% net
1998	71.05767
1999	72.22865
2000	72.331
2001	72.43609
2002	71.45881
2003	71.07157
2004	71.25889
2005	71.7161
2006	72.11656
2007	73.0385
2008	73.64887
2009	75.48694
2010	77.29202
2011	78.04696
2012	76.71784
2013	79.11945
2014	81.33552
2015	81.11686
2016	81.22773
2017	80.84479
2018	80.75856