Year	% net
1998	60.64323
1999	62.02128
2000	62.7066
2001	63.43926
2002	63.31473
2003	64.59492
2004	66.01198
2005	66.81065
2006	67.89524
2007	69.96361
2008	69.91141
2009	71.80212
2010	73.82039
2011	75.38487
2012	74.56589
2013	76.11492
2014	78.70527
2015	78.39649
2016	78.45527
2017	78.14456
2018	78.31161