Year	% net
1999	39.87152
2000	41.25065
2001	42.50186
2002	44.1865
2003	46.09408
2004	47.34615
2005	48.57895
2006	50.10845
2007	52.09465
2008	53.51995
2009	54.05185
2010	56.13494
2011	58.57387
2012	60.35019
2013	61.64642
2014	62.28577
2015	62.81074
2016	63.13206
2017	64.24908
2018	64.31126