Year	% net
1999	36.36152
2000	37.52671
2001	38.53731
2002	40.01771
2003	41.87168
2004	43.01751
2005	43.98605
2006	45.25852
2007	47.2152
2008	48.70133
2009	49.10457
2010	51.31839
2011	53.42572
2012	55.10399
2013	56.63724
2014	57.06014
2015	57.52835
2016	58.23183
2017	59.64078
2018	59.73422