Year	% net
1999	35.3923
2000	36.31408
2002	45.28042
2004	45.66849
2005	48.05055
2007	56.04339
2008	54.98171
2009	60.43652
2010	59.35178
2011	58.7365
2012	59.43192
2013	61.16985
2014	62.63808
2015	63.44083
2016	64.65094
2017	66.45009
2018	66.76219