Year	% net
1999	42.67374
2000	44.03907
2001	43.55946
2002	44.40113
2003	45.49268
2004	46.72312
2005	48.28139
2006	49.55216
2007	51.35748
2008	52.78759
2009	51.75124
2010	53.636
2011	55.02816
2012	56.49064
2013	57.77987
2014	58.20524
2015	58.35437
2016	58.75512
2017	60.17219
2018	60.93505