Year	% net
1998	21.2383
1999	21.58387
2000	22.42327
2001	23.35992
2002	24.5254
2003	25.52028
2004	26.82885
2005	27.83594
2006	28.78653
2007	29.84663
2008	31.40719
2009	32.60563
2010	33.93098
2011	34.14778
2012	34.42893
2013	35.28495
2014	35.91007
2015	36.66622
2016	36.82409
2017	36.90711
2018	37.16512