Year	% net
1999	46.65418
2000	47.98592
2001	48.29513
2002	49.33623
2003	50.5713
2004	51.78487
2005	52.70415
2006	53.88313
2007	55.66462
2008	56.59026
2009	56.23804
2010	57.59449
2011	59.24731
2012	60.25551
2013	61.51879
2014	61.96231
2015	62.28183
2016	62.44849
2017	63.31422
2018	63.86612