Year	% net
1998	63.43319
1999	64.78881
2000	65.06882
2001	65.49834
2002	64.813
2003	65.53962
2004	66.35183
2005	66.57847
2006	67.39964
2007	69.26867
2008	69.11426
2009	70.86298
2010	72.73673
2011	74.1276
2012	72.75098
2013	74.87834
2014	77.24058
2015	76.79223
2016	76.77502
2017	76.42637
2018	76.26289