Year	% net
1998	63.11582
1999	64.4935
2000	64.78723
2001	65.23438
2002	64.54944
2003	65.28628
2004	66.10484
2005	66.3269
2006	67.14554
2007	69.02305
2008	68.85499
2009	70.61718
2010	72.51025
2011	73.91779
2012	72.52229
2013	74.67815
2014	77.07188
2015	76.61732
2016	76.60009
2017	76.25016
2018	76.08895