Year	% net
1998	49.85554
1999	50.35684
2000	51.46995
2001	52.52999
2002	53.51749
2003	54.75491
2004	55.90513
2005	56.90115
2006	57.79032
2007	59.09127
2008	60.10605
2009	60.9676
2010	62.7457
2011	64.25291
2012	64.95989
2013	66.51271
2014	67.54648
2015	67.60717
2016	67.95685
2017	68.53343
2018	68.61016