Year	% net
1998	46.80208
1999	47.24292
2000	48.30969
2001	49.30187
2002	50.24468
2003	51.42416
2004	52.4879
2005	53.39994
2006	54.19374
2007	55.31767
2008	56.24784
2009	56.98961
2010	58.58402
2011	59.93885
2012	60.58257
2013	61.70152
2014	62.58371
2015	62.63716
2016	62.73325
2017	63.19568
2018	63.19792